Planning makes all the difference.
Set your goal for how much money you want to earn, a deadline for raising it and how you plan on actually raising the money. Then track your progress.
Most towns have bands that are looking for extra exposure. See if you can get the band to perform without payment for the benefit concert (allow them to sell CDs and hand out cards in exchange).
Success Story: Katie B. from Alabama held a benefit concert and got her entire delegation involved. The concert was free. The great door-prize tickets were $5. Each delegate received the proceeds from the tickets they sold. As a group they sold 4,000 tickets and raised more than $20,000.
Variation: Use the same concept for a smaller gathering, using your school's symphony at a local art gallery or coffeehouse or hold a benefit choir concert at a church. Or, if you play an instrument yourself, put on a recital for your friends and family!