How do I remove calendar events from the feed "all activities"?

No content types can be removed from “All activities”. That’s why its called “All”. ;-) 

2 hours ago, opentype said:

No content types can be removed from “All activities”. That’s why its called “All”. ;-) 

In the configuration of the "all activities" feed has to remove some things, except the events of the calendar. I asked if there was this option in some other configuration. My problem is that sometimes many events enter the calendar, so other things come out of the feed.

A work-around is to not show the All Activities feed, or at least not as default. On all my IPS sites I link to a custom feed in the menu by default – so I can control what appears in that feed. 

Yes, you can't adjust all activity, but you can create a new activity stream without Calendar if you wanted, and then add that to your menu instead of all activity.