The holiday season introduces operational challenges to running clinical trials – but these challenges are often predictable. The right CRO will demonstrate comprehensive planning to maintain continuity and ensure your trial stays on schedule, even during festive periods. Read on for guidance and a wish list for running clinical trials through major holiday seasons – and why partnering with a CRO with a truly global operational presence is critical for your study’s success. 

In short

  1. Even during major holiday periods that slow daily life in favor of celebrations, clinical trials must continue to ensure patients receive treatment, the schedule of assessments is maintained, and data is collected for approvals
  2. Global CROs act as the organized relative, managing predictable challenges of holiday disruptions with strategic measures to maintain trial continuity, compliance, and safety
  3. Choosing a global, experienced CRO with robust risk management and round the clock medical coverage will help effectively navigate holiday disruptions
  4. Use our wish list to evaluate potential CRO partners based on the essential capabilities your CRO should demonstrate to maintain trial momentum for your studies during the holidays

Clinical trial management challenges during holiday seasons

As we approach a major holiday period across much of North and South America, Europe, and Oceania (among other regions), we can feel our lives slowing down in anticipation of the break. However, as we know, clinical trials don’t slow down – they simply can’t. Enrollment and treatment must continue so patients receive potentially life-changing therapy, and sponsors can maintain a steady stream of important data relevant to regulatory submissions.

During festive periods, the CRO is the firefighting relative – the one who sniffs out where there are likely to be disagreements and diffuses them; who cooks multiple dinners for guests with different dietary restrictions; who checks dinner seating arrangements so everyone receives what they wanted (and can keep the conversation flowing); who organizes the gift exchange and keeps the receipts for refunds of unwanted presents.

Holiday seasons can affect trial continuity, protocol compliance, data integrity, and potentially patient safety. In global trials, asynchronous holiday seasons further increase complexity; Table 1 provides a non-exhaustive list of widely recognized, widely celebrated holidays across major world regions.

Table 1. List of widely recognized, most celebrated holidays in major world regions. 

Region 

Major Holidays (2026 dates) 

North America 

Christmas (25 December) 
Thanksgiving (12 October in Canada; 26 November in the USA) 
Day of the Dead (Día de los Muertos) (1 – 2 November) 
Independence / National Days (various) 

Latin America 

Christmas (24 December) 
Carnival (various; February) 
Holy Week (Semana Santa) (29 March – 5 April) 

South America 

Christmas (25 December) 
Carnival (various; February)  
Independence Days (various) 

Western Europe 

Christmas (25 December) 
Easter (29 March – 5 April) 
New Year’s Celebrations (31 December – 1 January) 

Eastern Europe 

Orthodox Christmas (7 January) 
New Year’s Celebrations (31 December – 1 January) 
Easter (29 March – 5 April) 
Independence Days (various)  

Middle East – Islamic-majority 

Eid al-Fitr (20 – 22 March) 
Eid al-Adha (25 – 28 May) 
Ramadan (17 February – 19 March) 

Middle East – Israel 

Rosh Hashanah (11 – 13 September) 
Yom Kippur (20 – 21 September) 
Passover (Pesach) (1 – 9 April) 

South Asia 

Diwali (8 November) 
Holi (4 March) 
Eid al-Fitr (20 – 22 March) 

East Asia – China 

Chinese New Year (Lunar New Year; Spring Festival) (17 February – 3 March)  
National Day (1 October)  
Mid-Autumn Festival (25 September) 

East Asia – Japan 

New Year (Shōgatsu) (1 January) 
Golden Week (29 April – 6 May) 
Obon (13 – 16 August) 

East Asia – Korea 

Seollal (Lunar New Year) (17 February) 
Chuseok (25 September) 
Liberation Day (15 August) 

Southeast Asia 

Eid al-Fitr (Hari Raya) (20 – 22 March) 
Christmas (25 December) 
New Year: Lunar (17 February) 
New Year: Songkran (13 – 15 April) 

Africa – North Africa 

Eid al-Fitr (20 – 22 March 2026) 
Eid al-Adha (25 – 28 May) 
Ramadan (17 February – 19 March) 

Africa – Sub-Saharan 

Christmas (25 December) 
New Year’s Celebration (1 January) 
Independence Day (various) 

Oceania 

Christmas (25 December) 
Easter (3 – 6 April) 
National Days (various) 

This list is not exhaustive and is based on a broad global consensus. Approximate dates are given for festivals where date of celebration is dependent on observations during the calendar year.

Simply: Clinical trials operate year-round; however, holiday seasons introduce significant, but often predictable, operational challenges that the global CRO has measures in place to handle. The CRO minimizes the impact of these challenges.

Read our holiday wish list: The most important things to look for when selecting a global CRO to ensure your trial stays on time. For further information about challenges during the festive period, keep reading! 

During the holiday season, while we embrace moments with loved ones, dedicated teams ensure continuous coverage for urgent inquiries. Their unwavering commitment keeps clinical trials running smoothly, offering peace of mind to sponsors

The holiday wish list for selecting a CRO

Like that one relative we all have who is incredibly organized and polished during the festive season, while everyone else is running around in full holiday panic, your CRO should have the experience and preparation to deal with difficult holiday periods. Holiday periods are not isolated, disruptive events, but a critical time to assess whether a CRO has the operational maturity to treat holidays as integral components of trial risk management. Use this wish list to help you identify which CROs are truly prepared to support your trial’s success during the holidays.

Choose a CRO with a proven global operational presence 

This allows for anticipation and adaptation to the staggered disruptions that occur across different regions during different holiday seasons. A CRO with decentralized hubs has expertise and experience embedded worldwide – meaning the CRO has real-time insights into regional patterns, cultural norms, vendor schedules, regulatory closures, and logistical constraints. Local teams with 24/7 operational presence can rapidly troubleshoot issues without being constrained by distant time zones or centralized escalation.  

The CRO can coordinate seamlessly across sites, labs, and authorities, all operating under different holiday calendars, to maintain momentum as one region starts to slow for a seasonal break. Global distribution improves responsiveness and resilience and strengthens relationships with sites and vendors – all of which help safeguard study timelines and data integrity.

Ensure coverage across the global holiday calendar  

Building and maintaining a global holiday calendar covering all trial regions, sites, labs, logistics partners, and regulatory authorities allows the CRO to model and anticipate staggered slowdowns in recruitment, data flow, and supply chains, and to adjust timelines and staffing accordingly. CROs maintain round the clock medical monitoring and case processing coverage to ensure adverse events (and serious adverse events) are reviewed and submitted per the required timeframes. Submissions are proactively scheduled outside holiday periods whenever possible. Such holiday calendars are integral for risk management, monitoring, and milestone plans. 

Robust on-call structures and role assignments, along with clear safety communication pathways and escalation procedures, are paramount at all times, even when certain personnel are unavailable. A pre-holiday safety review can help identify outstanding case follow-ups, reducing the risk of non-compliance during the holiday season. 

Ask about processes for proactive communication between sites, vendors, and sponsors 

Outreach is critical – confirming upcoming staffing levels, on-call coverage, and planned closures at least six weeks (ideally 10) before known holidays is a must. Outreach to labs, couriers, and vendors to identify reduced hours or busy periods helps navigate operational response. Close communication with the sponsor, ensuring they are well-informed, is also key.  

In addition, a global CRO with local presence will have specific knowledge of the site’s typical staffing levels and operational closures during holiday seasons. This gives the CRO extra information on which sites are likely to be best suited for selection for the duration of the trial, as well as the site’s flexibility to adjust activities accordingly (such as proactive arrangements for onsite monitoring visits) during festive periods.  

Check how the CRO will maintain focus on the patient 

CROs should work with sites to optimize patient visits around holiday windows – potentially adjusting these where allowed in the protocol. CRAs should help sites understand whether the protocol allows consolidated assessments, planning backup clinic days, or alternative facilities for sampling for time-sensitive endpoints.  

Telemedicine or remote visits are useful for maintaining continuity when patients are travelling or otherwise busy, and when sites are short-staffed. CROs also support sites with patient communication tools tailored to regional holidays to maintain engagement during extended holiday periods. 

Ask how the CRO will manage hurdles in the supply chain 

CROs coordinate early IP resupply, increase site safety stock, and pre-book shipments to avoid courier capacity issues. Alternative transport routes or backup couriers are also important to identify. Depots are consulted in the weeks leading to a holiday to ensure packaging, labeling, and release activities avoid closures. Real-time shipment tracking enables the CRO to monitor temperature- or time-sensitive materials.  

Prioritize CROs with well-defined data processes 

“Front-loading” monitoring activities before the holiday period (if the protocol and Monitoring Plan allow) and providing initial support for centralized or remote monitoring helps maintain data accuracy and integrity during holiday seasons. Critical datapoints (safety, dosing, primary endpoint data) should be prioritized. Monitoring cycles are planned in advance to cope with increased load after the holiday season. 

The festive periods are times we all look forward to celebrating with our families. In the world of global clinical trials, the preparation, drive, and experience of your global CRO are the gifts that mean clinical trials proceed seamlessly and on time during holiday seasons.

Key takeaways

Holiday seasons are an unavoidable part of global clinical trials. Predictable yet complex disruptions that ripple across sites, vendors, supply chains, and regulatory bodies influence recruitment, patient adherence, data, and study timelines.

Much like that amazing family member who coordinates the festive feast and gift exchange, the global CRO (with robust experience and expertise in operational planning coupled with a worldwide infrastructure) helps trials proceed through holiday periods without a hitch. They are instead predictable, manageable variables, part of clinical trial risk management, and, with a well-designed trial strategy, enable sponsors to maintain momentum and confidence in meeting trial milestones throughout the year.

Choosing your global CRO is like picking a gift – a poor one may leave you disappointed and with unmet expectations, whereas a thoughtful choice will bring joy and success.

Check off your CRO wish list with PSI this season

Abbreviations

CRA, Clinical Research Associate;
EDC,
electronic data capture;
IP
, investigational product.