What music should my band play?

My band has been invited to play at this event for a foreign affair matchmaker company. We usually play alt-rock songs, both original compositions and covers, but I suppose we gotta tone it down a bit for a socials event. I know it seems like we're selling out, but we have to be realistic here. Our band needs the money to finance our studio time, plus other expenses for our equipment. What music should my band play? I need suggestions in the form of musicians or bands that would fit in with this type of event. Thanks!