How long must an event holder keep the records after the event has taken place?

The correct answer is based on the regulations surrounding the retention of records for events held by practitioners, including chiropractors. In California, event holders are required to maintain their records for a period of at least five years after the event concludes. This requirement is in place to ensure that all pertinent information is accessible for reference, which may be necessary for audits, inquiries, or potential legal matters arising after the event.

Maintaining records for this length of time allows for the availability of documentation that can support any claims or disputes regarding the event. Additionally, it aligns with broader practices in health care and professional services, where retaining records for a significant period is essential for accountability and compliance with various regulations.

The other options imply shorter retention periods, which would not meet the standards established for record-keeping in this context.