For some light IRS Reading you can CLICK HERE.
 
First we have to say we are not tax experts and we suggest you consult with a tax specialist for your specific circumstances before you make any final decisions about tax implications for fund-raising events like ours.
 
With that, it is our understanding, and others CLICK HERE that all expenses directly related to a fund-raising event like ours are generally tax deductible on your federal taxes.  This would include registration fees, flights, pre and post hotel and other expenses directly related to or getting to the event.  Also, generally deductible are any costs associated with the act of fund-raising, like printing, postage, and thank you letters or post cards mailed to your donors from the event.