Heads up on Eventbrite ToS:
As an Organiser, you grant permission to Eventbrite to enter onto and remain on the premises where your event is hosted with personnel and equipment for the purpose of photographing and recording the Premises … You … agree that Eventbrite will own all rights of every nature whatsoever in and to all films and photographs taken and recordings made hereunder (the “Recordings”), including without limitation of all copyrights therein and renewals and extensions thereof, and the exclusive right to use and exploit the Recordings in any manner, in any medium or context now known or hereafter developed. You, on behalf of yourself and the Subjects, grant Eventbrite and its licencees the nonexclusive right to use the names and trademarks of you, the Premises, the Events documented in the Shoot, and the Subjects in connection with Eventbrite’s and its licencees’ use of the Recordings.
You are responsible for obtaining, at your own cost, all third party permissions, clearances, and licences necessary to secure Eventbrite the permissions and rights described above.
Seems a tad overzealous.