I always bring my better half, unfortunately she waits for me in the parking lot. 

(My wife will kill me if she reads this. Love you Sweety!!)
Hmmm. we go solo.. Normally... You are welcome to bring the SO. Just be warned, we chat about cars ALL THE TIME. She might get bored. Also, it may become rowdy (Allthough I don't think MattQ is coming).
At the end of the evening we hang around the cars for at least 30 minutes.
It's your call.