As someone in the arts administration world, I can tell you that the ticketing app is not a great shot. I'd never heard of Guestlist, and EventBrite is fairly new but used, but most people these days are using bespoke solutions (TicketMaster, Tessi, etc...) and most midsized organizations I know have floated to Brown Paper Tickets.

However, I think I can safely say most midsized resident arts organizations would love a social media reporting app. Most non-profits can only hold a social media intern for the summer, and they dip off and seem awkward during the main part of their season. To alleviate this would be awesome.