Also is it polite?impolite?expected?norm? to offer vodka before heading out.
In Poland, people usually drink sth before going to the club.
Often at a small "before-party". Partly because it is much cheaper than bying alcohol in the club. And partly because it gets you "in the right mood for clubbing".
Ask the girls if they want to come for a little before-party, and drink a little vodka or a few beers.
If you dont like the idea with vodka, just get together, and take a beer before going to the club.