Application for NFP status not yet approved when we collected money for our event; 1099 issued to me. Any way to avoid paying tax at my marginal rate?

501c3 status was finally granted in November; we applied a year ago February. We started collecting fees for our event but had to do it under my name, as sole proprietor. The money went directly into the nonprofit account. The 1099 was issued to me. Is there any way to avoid paying tax at my marginal rate? And no, itemizing will not exceed the standard deduction.