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Tend to meet in bar/coffee area, both carry laptops, and paper notes, working on when the other arrives. Chat as normal when meeting anyone, talk of travel, meetings, projects. Finish drinks and move upstairs to look at notes, etc. I guess the key word is discretion, you may know what you’re there for, everyone else may guess, but you don’t need to advertise it?
One friend I used to meet, preferred meeting in a club – less pretence, more open, more honest. However that was pre-covid, post covid finding a hotel with day rooms is difficult, finding a club open during daytimes is almost impossible (please, someone prove me wrong )