Another thing that hasn't mentioned is the ability to read cues and communicate on stage. This can help greatly for songs you aren't totally familiar with. It can be anything from a pre-performance huddle where you teach the band-members a song on the fly, to using eye contact and nods, to hand signals, etc.. Players who can communicate on stage, and especially mid-performance are valuable, and reduce the stress of performance.
I would hope if I said the following to someone, it would make sense and they can do the tune good enough for drunks.
"We're doing Hungry Heart by Springsteen, key of G. Chords are G, Em, Am, D throughout. Band starts out together, keyboard intro and then the verse. The solo part will follow the same progression but raised to Bb. Watch me for the change. After the solo, we go back to G. Ready? OK. 1 and, 2 and, 3 and, (drums come in), 4 and....."
Back to the OP........
Maybe you might want to take a little time to talk to the bandleader about their stage lingo. Find out who gives cues, and/or what signals they may use for a stop, break down, etc. If they use any lingo, such as name for a groove, clarify it so you don't misunderstand on a performance. For example, "Latin Groove" could mean a rhumba, bossa, etc. Or a hand with 1 finger pointed up could mean key of G, repeat once, return to first verse, or modulate a step. Clarify when possible.