"We're having our first ever house concert here a week from Saturday. Any last minute advice?
Well, I think that's a cheek, coming onto a "Folk & Blues" site to ask advice about "house" music! :0)
But seriously folks... Is this going to be a formalised concert (audience to sit down & shut up) or a more interactive, (bring your instrument & join in)?
If the latter, then you're seating needs to be more flexible, to allow any additional musicians to see/ hear the others. Best of Luck! Eddie