You should purchase event insurance as soon as you start booking venues, vendors, or making deposits—ideally weeks or even months ahead of your event. Most policies need to be purchased at least 24 to 48 hours before the event takes place, but some may have longer lead times, especially if they include cancellation coverage. Buying early ensures that you’re covered for any issues that arise during the planning phase, such as a vendor backing out or needing to reschedule. Delaying coverage could mean you’re left unprotected if something goes wrong before the policy is in place. Early purchase equals better protection.