That looks like one of the early QuakeCons. Always wanted to attend one. I still remember the first QuakeCon when Dennis Fong aka Thresh won John Carmack’s Ferrari for taking first place. We used to play against his clan Death Row on Stanford.edu quake servers when we would drag our PC’s to UBC to utilize their T1 internet pipe. We would get our asses beat but it was fun. Gaming, eating takeout and downing can after can of Barq’s till the wee hours.