Shawn Melton (1/21/2016)
You might try going to the event but you would not be guaranteed entry to participate. It depends on the location and region, as areas like Atlanta tend to fill up quickly and the waiting list is quite long.
As Shawn says, it depends on the location. I've attended multiple SQL Saturdays in New York City in which building access required a security visitor's pass; for those, registration is pretty much required. On the other hand, I've been to other SQL Saturdays where it seemed like you could register at the door. And as mentioned, it might also depend on how many seats or how much space is available.