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If I did this more than once a year - or with attendees I did not control - I would look into wireless authorization. Not just for the lower rate (that will add up if you process a lot of transactions), but I think you have a much better argument against chargebacks if you swipe and process the card at the time of transaction.
I've also had problems where people submitted AMEX (which I can't accept) or out of date cards. Using wireless authorization, we would have caught those issues immediately, rather than having to track down people after the fact.
In short - I don't use it for my rather unique circumstances, but I can easily imagine it being worth the investment.