I agree this looks a bit vague to what this is. It needs some more text on the side or bottom to describe what this even actually is, maybe even photography from places happened before. To me flyers make sense, if its already widely known and this is just a reminder to when and where to come, not why or what it is. And the big Bring your Own! sounds like its a must, because the "or" is very small compared to it that one may miss the connection.
Ideally there is a website for people to visit, maybe even with a QR code to scan.