No. A volunteer is not expected to cover any expenses on behalf of the band out of their own pocket! Depending on the activity or event that you are helping with or organizing for the Band Boosters, you should have a budget. The budget should have projections of expenditures and proceeds. You should receive approval for the budget from the Booster Executive Board prior to starting on the project.
Forms for approvals, money to be reimbursed or deposited, etc. can be found on the Thunder Band web site, under the About Us tab, Documents and Forms.