Running in one form or another since 1997, Logan's Open Stage is the most welcoming in town. We don't give a crap how bad or good you are - play some songs (or tell some jokes, or perform some puppetry of the penis) and you're part of the crew.
For physical events that happen at a specific time. For example a concert, or dance performance. If there are multiple shows, you can still duplicate your event to cover them all.