What is this "Monday Night Geek Pizza meet" of which you write?

Bunch of geeks meet outside the Regent Street Pizza Express at 6:30 on Monday evenings, eat pizza, geek vigorously about whatever happens to interest them at the time, and then typically retire to someone's house and drink coffee and/or port. Apparently it's been a longstanding tradition for somewhere in excess of ten years now, though I've only been going to it for two or three (I lose count).