Say if you hear a group of people you know, chatting about going to an event that you'd like to go to, is it ever acceptable to say 'hey, can I come along?'. Would that sound desperate/cheeky/rude? Obviously I'm talking about a public event here, not a private party or function.
I nearly did this on Saturday but stopped myself at the last minute. It was on the tip of my tongue, but I didn't want to put them on the spot.