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It's called waving and saying hello.
Do you have any beer on ya?
'Hey, campers! Got some beers/dogs left over from the last cookout, want any?'
If they say no, fuck em. If they say yes, you either get some convo for the night, or at the very least, did a nice thing, which is reason enough in itself to do it.
Ask them if they need help with anything.
Ask them if they know about the ticks in the area.
If you don't actually want to talk to them and just feel shitty because you aren't living up to someone else's metric, fuck off.;