Problem with these things is you can make yourself out to be not welcome despite best efforts, some attendees are utterly hopeless / shameless that they'll decline any offer of drink (soft drink or otherwise), demand free tap water, speak like shit to staff (grunt with no thanks or please), leave no tips, sneak their own beverages in, complain wifi is slow and so on. I wouldn't host an event in a bar unless I knew the people attending, you're judge by your company after-all and if you want to come again then bringing shameless mingebag joe no manners is not a good idea. Note: this shitty behavior isn't isolated to tech groups, bridge groups and other card game groups are apparently worse that they now have to rent out community centres.