i'm not saying they should be required to prevent it, just that it would be nice if they did.
how about this:
you've got a line of people waiting to get in.
instead of opening the doors and letting them all in at once, let 20 or 30 in every minute. you could even start 15 or 30 min. before the regular opening time so that the doors can be open to all at the regular opening time. i'm not exactly sure how many people are in line so you could adjust that accordingly. the idea is not to let everyone in at once.
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