You lose the temporary consumables at the start of the event. I used every last burger during the last event (even got a 5SR on my last spin of the gacha) but I'm sitting on a TON of shakes that would have been amazing for gambit. But they're going to be useless in a day and a half, so I'm burning them like crazy.
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Do you have any idea how much stamina it takes to complete every mission without using a single card reveal or gacha ticket? Oof. Getting those three SRs took over 5,000 stamina just for that mission. It took over 12,000 to finish everything except the pie to the face challenge.