i think leave a place next to each item for like a hole punch. there is no way we are going to remember who did what as the night progresses. 4 or 5 people and 12 challenges and at least 3 or 4 bars? we'll forget. i can be the official task master and punch holes as you complete them.
or maybe sharpie as a slightly less permanent solution. but i like the hole punch idea. haha
if it's free for you, i would rather have too many than not enough. hell, even if we have a solid list of participants, we very well may add 1 or 2 as the night progresses. better to be prepared for that.
the list so far is 5, right? i would double it. again, assuming there is no cost to you to do that.
if there is a cost, i would still do 1 or 2 extra just to be safe. so like 7 maybe?