You can deduct those expenses as "other miscellaneous expenses" and in TurboTax you will be able to describe the expenses individually, as you have described them here ( catering, materials, speaker fees, etc.). I would recommend that approach rather than reporting one large sum.
Be sure that you understand the rules for issuing 1099's to the speakers, if you paid any one individual $600 or more for the year.
The fact that your expenses have increased proportionate to your income will not raise any particular red flag. Returns where the expenses are disproportionate to income are more likely to be questioned. And in any case, you will have documentation to support the expenses that you claim.
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