I keep looking at that Most Online Ever stat and thinking, "Huh? May 7?" I remember noticing it less than a week afterwards and knowing that I wasn't been logged in at that time, and I didn't think there was any particularly riveting topic going on, so it will remain a mystery to me until we get a new Most Online Ever stat.
That was just a weird moment in time when, for whatever strange reason, 74 people just happened to visit the forum at the same time. And quite honestly, I don´t place much stock in the Most Online stat because the only thing it measures is pure happenstance. For example, say no more than 5 people might happen to be on the forum at any one time on a given day. Well, that doesn´t in any way mean that more total people couldn´t be visiting the forum on that day than on a day when the most on at any one time might reach, say, 30. All a Most Online stat of 30 means is that 30 people just happened to all show up at the same time. I don honestly know why the YaBB/SMF developers even came up with that stat except that perhaps they love to show off how they can count things because, in the grander scheme of things, it can basically be almost meaningless. :-
About the only interesting thing about that current Most Online stat is that on the West Coast it took place in ´07 at 07:07:07pm. It´s just too bad that something like it didn´t wait to happen until July with 77 people on at the same time or on the 7th with 70-something people on at the same time because that would be a supposedly magical seven sevens.
But who knows, maybe it will happen in July in some time zone.