I tried to get an approximate number as to how many players showed up & attended the event (the first picture was taken before the event even started), but there were too many players for me to get a proper head count or to pull all of their bars up. In the second image there are at least 25+ players attending for skill-gain.
I believe we hit over 40 heads just on the "resist" side of the event. We also had 15 caster at one point that I'm aware of. Event is still going strong