Here are a few tips on how to make some extra cash booking a comedy show:

1. Do two shows. Most comedy shows consist of a headliner, a feature, and a host. As a result, most comedy shows are 90-120 minutes in length. This allows you to book an 8:00 and a 10:30 PM. Ask the comedians for a lower fee to do the second show and maximize the rental cost of the venue.
2. Do an after party. Many comedians will make an appearance for about half their performance fee. Some will do it for free drinks. Negotiate the best price. Tag the party info on your radio and televison commercial, add it to flyers, and mention it constantly at the comedy show. Charge an admission fee for the party. Offer a discount to all comedy show ticket holders.
3. Allow comedians to sell their CD/DVD before and after the show, if they stop by your after party for free.
4. Get a photographer to take pictures for sale with the comedian after the show and at the after party.
5. If you are renting a ballroom, get the rights to sell all the alcohol at the event.
6. Charge a small fee for local comedians to do a short set. Some will jump at the chance to open for a big headline act.