Bartender tip jar and added gratuity?

We had gratuity added to the contract and on top of this tipped each staff member individually (because as mentioned gratuity on contract does not just go to the bartender) so therefore I insisted no tip jar for the bartender. Thankfully the catering company was not going to have a jar out anyway and to be honest, I do find them tacky - we really wanted our guests to come, enjoy, have a drink and not be digging into their pockets but that was just us. Had the catering company asked to do so I would have rejected the request.

Most weddings I have been to have tip jars at the open bar. The Grat is added to your bill, yes, but that 20% isn't just for the bartenders, it gets split among the servers, chefs, bartenders, banquet staff (those who help set-up/tear down events), so it's not uncommon for the bartenders to put out a jar or two. I typically tip them $20

I've seen tip jars at venues with open bar service that tacks on gratuity. It's common and a few people might throw in a tip thinking they can get better service, but most people I know just ignore it.