I did. I usually get there 20 or 25 minutes before any show, to settle in, use the facilities, etc. As far as the "briefing" all you need is time to put your stuff in the locker, if you have any, and have them tell you not to leave the stage til the houselights are up, that the cast is going to be sitting near you and not to bother them, etc. It's no biggie.
It's just a message board. Let's not take it too seriously.