You're not able to deduct the value of your time. No matter how valuable your time is, you can’t take a deduction for the time you spend in charitable endeavors.
The expense you incur for any supplies you buy for event may be deductible. If you incur fundraising expenses, those expenses will be tax deductible as well. You may deduct parking fees and tolls, as well as mileage at 14 cents per mile. If you use public transportation during your volunteering, that’s tax deductible as well.
You may read TurboTax faq for more information:
https://ttlc.intuit.com/replies/4797925
