How do you get income for choir expenses?

The choir has been recognized by the IRS as a 501c(3) non-profit organization and we encourage our fans to help support our activities though tax-deductible donations. We have a number of recurring expenses that are subsidized by our venue sponsors or free-will offerings. We have a minimum honorarium for each type of concert we give, but we have waived this fee in certain situations. We now have two CD recordings which provide additional income. Members also support the choir by paying nominal annual dues.