I would say yes. There are always people looking to fill a slot here or there during the Con. Also, based on last year's numbers there will be a fair number of attendees that have no pre-registered and arrive the day of. So obviously they will be looking for available seats.
Some things to keep in mind however. The Program has gone off to the printers so your games won't be listed in the program, but your games will be listed on the site and listed on various signage. Saturday is almost completely full. So it is unlikely we'll be able to find you a table on Saturday. Friday and Sunday morning are your best bets for finding open space. Also registration closes the 15th so if you are going to do it, I'd hop right on that.
All that being said, I would still encourage you to go for it.