Event validation errors

Your event won't publish, and the message points to an event-specific problem. Below are the most common causes by area, each with a plain-language fix you can apply yourself.

Booking notifications

• Booking confirmation email is missing — when booking is enabled, attendees must receive a confirmation. Open Build > Notifications > Booking Confirmation and enable it globally or for this activity.
• Booking cancellation email is missing — recommended when attendees may cancel. Enable Booking Cancellation globally or per activity.
• Reminder is on but cancellation email is off — when reminder emails are active, the cancellation email must also be on. Enable Booking Cancellation so attendees are informed if their booking changes after a reminder goes out.

Slots and dates

• Two specific dates overlap — open Slots > Dates > Specific Dates and adjust the conflicting sessions so each one ends before the next starts.
• Two weekly time ranges on the same day overlap — open the affected weekday in Slots > Dates > Weekly and separate the overlapping ranges.
• A slot falls outside the campaign dates — check Slots > Dates > Specific Dates and move the slot inside the campaign window, or extend the campaign dates.
• Slot division is on but no dates are set — set at least one date before turning on Divide into Slots.

Tickets and capacity

• No ticket types configured — open Slots > Tickets and add at least one ticket type for the bookable activity.
• A ticket has no display name — open the ticket in Slots > Tickets and enter a name attendees will see.
• A ticket's capacity is zero — set a capacity above zero so the ticket can be booked.
• Limit Availability is on but no sale dates are set — fill in both Availability Start Date and Availability End Date in the ticket settings.
• Sale start date is after sale end date — make sure the start date is earlier than the end date.
• Per-contact limit exceeds total capacity — lower the per-contact booking limit to be at or below the total ticket capacity.

Check-in setup

• Early check-in window is negative — set the early window to zero or a positive number in Slots > Check-in.
• Late check-in window is negative — set the late window to zero or a positive number.
• Check-in form is on but no template is selected — choose a form template in Slots > Check-in.
• Custom check-in end method but no late window — when using the custom end method, add a late window value so OmniLab knows when check-in closes.

Booking restrictions and special event modes

• Booking limit per contact is set to zero — enter a positive number for the per-contact booking limit, or turn the booking limit off.
• Validation codes restriction is on but no pool is selected — choose a validation codes pool or remove the restriction.
• Check-In Only mode needs exactly one technical ticket — open Slots > Tickets and make sure there is exactly one technical ticket configured.

Notices that don't block publishing

Some results are reminders rather than errors. A notice about a large early check-in window or a check-in form requirement is a prompt to review your setup, not a blocker. Read it, confirm it matches what you intended, and continue.

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