Thanks for the replies.
I didn't end up bringing a bike based on feedback and weather forecasts - not even an expendable "beater" bike. Turned out the weather Friday-Sunday was mostly OK, and the bike would have been useful for getting from where I parked my car affordably to & from the hotel (well over a mile across downtown). Never saw a rack, but did see many riders on Harbor and other streets. The meeting / expo schedule wouldn't have left much time for recreational riding. Monday and Tuesday were wet. Ended up walking many miles instead, but muddled through OK.