Marriott Conference Centers generally offer flexibility for their clients regarding changes or cancellations to conference reservations. Typically, policies surrounding modifications and cancellations will vary based on the specific venue, the type of event, and the terms agreed upon during the booking process. It is important to refer to the original contract or booking confirmation for detailed information on deadlines and potential fees associated with changes or cancellations. If modifications are necessary, reaching out to the venue directly or checking the current web page can provide the most accurate guidance on how to proceed. Be aware that in some cases, early communication can allow for smoother transitions while minimizing disruptions for both parties.