I personally know people who avoid specific bars because specific patrons have been jerks, and they’re making others uncomfortable. Some sort of simple membership could keep them out.
What is there to fund? You just have to advertise a bit a meetup in some social medias and choose a place.
During the actual event, you aren't the one serving alcohol, there is nothing to be liable with and people are free to order non alcohol drinks.
It is just random people meeting at a bar.
As it was mentioned in the comments, it usually boils down to regulation and financial problems to have a place like that, unless you've been grandfathered in.
Anyone that has an option to earn good W-2 income would need a huge carrot to incentivize them to forego that low liability lifestyle and instead opt to start their own business, especially one where you invite people into your premises.
Until you are making good money (and this can take 10+ years) and can afford lawyers, you are at the mercy of the legal system.