I don't see how telegram isn't a gated community. There are mods. Only specific topics can be discussed, even if most groups say talk about whatever, if it's too much off topic they will tell you to take it else where. "It doesn't belong there" is a ux problem. Let's say I am a member in 5 groups. I post 1 event per week per group. If I just show all of my events for a specific group that is basically spam to that group. Ok, you say the solution is tags, which I accept solves that single problem. However then the problem is events on global, that, while not private are not shown in their context. If I go to global, I want to see events in context. While grouping these by tags makes sense, I don't want these shared to global unless I explicitly share them as global. For example an event where I can only fit 10 people in the venue. If I use the same kind, the event gets too much attention and then my venue doesn't work. The context also is a bigger issue than you're making. Showing global where half of the events aren't intended for you to see them (but it's not a problem if you do) is a ux problem. Imagine you're at a conference. The location of each session is just room a, b, etc. That event only makes sense in context of "we are all in this building" so showing that on global is dumb.

@hzrd149 can you make this point better since it's your idea? I still agree with it I just don't think I'm making it succinctly