Hi Fred,
Our Community Events plugin allows users to submit events, although there is no built-in way to limit the submission by venue or date. You can give managers different abilities on the back-end using a user role plugin. That includes changing events submitted by users. However, I don’t believe there is a built-in way to limit managers to single venues. These things may be possible with some third-party customization, but are not currently part of the plugin. Does that answer your question?
Cheers,
Leah