The venue expense could be listed as 'rent' or as a miscellaneous business expense where you can specify a description and the expense amount.
The speaker fee may fall under contract labor if the speaker was an independent contractor. Also, if that is the case, you would need to issue the speaker a Form 1099-NEC if you paid them more than $600.
If the speaker was not an independent contractor and you paid a company for the speaker's services, then you could list that expense as a miscellaneous business expense with a description and amount.
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