That depends on the type of people you're casting ... kids, adults, combination?!  If you want to make a lot of money, cast kids (and take a lot of asprin!).  Everyone will come see them.  Might I suggest 'The Best Christmas Pageant Ever' for a holiday show.

You could always think of casting "OLIVER!"

Anything with a large cast of kids will guarantee a large audience, which is just what you need.  Of course many of these shows will have larger up front costs. 

Best Christmas Pageant Ever is great, can be done very nicely with very little set.  Although set a few decades ago, I don't recall any specific time references in the script so it is possible it can be done modern.  Cast can be as large as you need, and with the exception of 5 or 6 adults it is all kids. 

Another way to go could be with a well known comedy, Neil Simon comes to mind.  As most of his shows were made into movies, and of course their is The Odd Couple (several TV shows, couple of movies).  People will come out because they know the show, and casts are large enough that the friend and family tickets will help. 

Good luck

We performed the Back to the 80's production last fall. The only word I can use to describe it was unbelievable!! We sold out all of our shows and were asked to carry over into the next week because of calls for tickets which we were unable to due to licensing.

People were literally dancing in the aisles when the muscial parts of the show were performed. So many people have written & called still a year later talking about how great the play was! On closing night, the performance ended just before 10 pm and it was midnight when we shut the doors forcing people to leave. Everyone was dancing, reminicing, and having a great time! I would highly reccomend this production.

We had kinda a pre-show that showcased some famous 80's moments that people kept giving standing ovations for and that was even before the prodcution even started. We had a cast of 75 in this production ranging from 7th - 12th grade! Kids did not care if they had a big part or not, they just wanted to be a part of the fun.

The greatest thing for me as the director and a graduate of the 80's was watching the kids fall in love with the 80's music and soon the kids were wearing even leggings and clothes to school from the 80's. Also, there was a great interaction between the kids and their parents because the majority of their parents also graduated from the 80's.

Unbelievable show!