I am having the identical issue. I am not running any other plugins but the Events plugin. This is a huge issue, can’t believe more people haven’t commented on it.
Well, i’m aware of how to fix the problem after it occurs, deleting the .maintenance file and renaming the plugin fixes the site, etc. I’m trying to figure out how to stop my sites from getting stuck in maintenance mode.
I’m not really getting a specific error, it just says “Please deactivate your plugins before enabling the Network feature” and a link to the plugins page. I first clicked the link, went to the plugins page, disabled all my plugins, still get the message “Please deactivate your plugins before enabling the Network feature” when i click on the new Network Setup link. I went as far as deleting all my plugins yet i still get this message when i click on Network Setup.