Hello,
I'm ready to help with this app. Your project description is well written. The only thing that I think may be improved is to let user specify on which date photos where taken, since most people would probably upload them not on the same date as the event happened. Also, it's possible to detect date from the image file itself, if the camera saves it.
If you don't mind giving read access to existing code, I could reuse current base templates or models (i.e. for events) when possible to make app integration easier for you.
Best regards, Stas.