Bible lessons, missions stories, and values lessons are presented by puppeteers, skit teams, singing teams, and even Christian magicians. Bible colleges often provide teams to help in these rallies. Teens and adults from your own church will be a great help also. You will be surprised at the hidden talents you will find among your church members or in your community. Pros and cons Cost is minimal, since supplies for lessons and crafts aren't needed.
Volunteers are happy to help, since they get to take advantage of the entertainment also.
About the only thing needed in addition to the people on stage is refreshments if you choose to have them. One very successful kids rally hit 150 on the first night and grew to 400 on the fifth and final night. This church had never had over 100 children in their previous VBS's. A Methodist church tried a kids rally format with a storyteller presenting the parables of Jesus, followed by group crafts and refreshments. This was a great success in all ways, including numbers.