Well never been in a pipe club but I have herfed with Cigar guys for the last 20+ years, one group the S.H.I.T. herfers (So Happy It's Thursday because we met every single Thursday night for over a decade), some times we would meet at someone's house, sometimes it would be at a lounge if no one could host or if a new guy was showing up, don't really like to let someone you never met in the house don't cha know.
If we met at one of our houses, most people would bring beer, more than you would drink yourself, don't be a douche and bring two beers and drink 15 that other people brought, the house would have bottles of booze but it never hurt to bring a bottle, bring your own sticks, don't be a "Josh" and show up with nothing and drink other people's booze and bum cigars off them. He didn't last long. The host would supply dinner, either something they cooked, bbq, or order pizza or something like that, after a while we all started chipping in a few bucks just so the host didn't have to pay, 15 guys showing up dinner can get pricey.
If we met at a lounge, we would each buy one or two sticks, then most of us would smoke our own, but seriously buy at least a stick, then everyone drank like fishes so the lounge was happy. 9/10 you buy sticks they don't care if you smoke your own and they don't hit you with a cut fee, unless you are Josh, which was hilarious they would always charge only him the cut fee, it's like the staff knew he was a douche right off the bat.
If we go to a large annual herf at someone's house it's always good to bring a host gift, a nice bottle of wine or something that he could share with the wife, this was always what I liked to do personally, and of course a nice cigar for the host as well.
I'm sure there is more but you can figure it out from there and I'm sure some of it at least translates to pipes as well.