I would recommend a simple video highlighting the simple sign up process. 1-2-3 really prove to people that it takes minutes focusing on the number of steps involved and that the screens are not very long (not much scrolling).

Then I would focus on the ease of creating an event. Again hopefully 1-2-3.

The same or another video would contain the end user experience of buying tix for your event. So before signing up for anything you have a full blown view of what signing up will be like, setting up an event, and what your event goers will be experiencing.

Great idea. Best of luck.