He may only need to put them on one person - a child - to get everyone else to stand in line and get theirs. (Or a handful of people that he knocked out first: couple of kids, couple of the managers' spouses, etc.)
If he says, "Play along or boom; but if everyone does their parts and BATMAN AND I HAVE AN AWESOME DATE, then they all come off safely at the end of the evening," that could get everyone to put up with it.
Maybe.
And presumably, Batman doesn't have an easy way to contact the League and explain the situation ("all the bombs have to be removed before Joker notices anything") without the risk that Joker would notice fast enough to push a button.
Superman or Flash could do it - probably. If they knew in advance they had to not be seen before they were done. If they can get to everyone. (Is everyone at the carnival? Are some of them locked in a cage underground?) If the bombs aren't rigged to go off if they're removed without a failsafe. And so on.
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If he says, "Play along or boom; but if everyone does their parts and BATMAN AND I HAVE AN AWESOME DATE, then they all come off safely at the end of the evening," that could get everyone to put up with it.
Maybe.
And presumably, Batman doesn't have an easy way to contact the League and explain the situation ("all the bombs have to be removed before Joker notices anything") without the risk that Joker would notice fast enough to push a button.
Superman or Flash could do it - probably. If they knew in advance they had to not be seen before they were done. If they can get to everyone. (Is everyone at the carnival? Are some of them locked in a cage underground?) If the bombs aren't rigged to go off if they're removed without a failsafe. And so on.