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Consider using high school students for this, since they often need community service hours in order to graduate. You want to know exactly how much money is coming in the door and through your vendors to your cause. You can use this later to announce your success or persuade to crowd to donate more to help you reach a goal. With the decline of cash payments, many people will no longer be carrying cash around with them. Consider using a mobile payment processor to allow guests to buy tickets and donate. There are several options to choose from to be sure to do your research. Make sure the venue, vendors, and your volunteers are ready. Reinforce why you are all there and the difference you are making. Walk around and thank your guests for coming. Be sure to also thank your sponsors, artists, and other contributors on stage during a break in the band's set. Track the successes and mistakes of your first concert and implement changes in the following ones. You made this happen, and with luck you will be able to call it a success. Whether you raise $10 or $10,000, you've brought people together for a cause you believe in and a good time.

Summary:
Find volunteers to take tickets and lead people to their seats. Devise a money-management method. Arrive at your venue early on the day of each event. Thank your guests. Learn and improve. Enjoy your concert series!