I can prevent an event from a calendar I control from displaying on my calendar, by deleting it. I would like a way to similarly remove from my display an event from another calendar that I'm viewing, without hiding EVERYTHING from that calendar. Is there a way to remove events from those other calendars?
Not that this is the answer you're looking for, but I'm 99% sure the answer is simply: you can't.
I guess if this is something you absolutely had to have, you could write your own version of Google Calendar using the API, but that seems like a long way to go for one feature. I'd recommend you submit feedback to Google, but don't know that it's something they'd consider adding.