I have the exact same problem! Once an event is saved, it can’t be edited or published anymore, clicking the buttons does not have any effect.
This also (but not only) affects community events. If the setting is that they have to be reviewed, they can’t be published at all: event drafts submitted through community events cannot be edited or published either.
The only way of publishing events is to create them from scratch and publish them immediately, without saving them first.
Please fix!