Attackpoint says Sept 24, CAOC Schedule page says Sept 25.
It’s the 24th Saturday as the Bears play the 25th at home.
Does your whole city shut down for a football game? Wow, here in Victoria we have the biggest football game of the season (the AFL Grand Final) in Melbourne on 24 Sept but that didn't stop us putting not one but two state level orienteering events on that day to kick off a national carnival with hundreds from around Australia attending (at least 550 of which won't be going to the Grand Final). Mind you this is the case every year with the clash but the carnival is only in Victoria (where the GF is held) every few years.
60000 at a Bears game, 100000 at the AFL Grand final. Attendance for the orienteering will be nowhere near 550, I'd guess 10%-20% of that. Maybe it's just that the organizers want to watch the football game. They're probably excited, because the Bears are undefeated so far this year.
Fair call, I've moved event dates that I've been the organiser for in the past (and in the future) because I thought I might have something else on.
This is an urban street event - traffic congestion will presumably be a safety consideration. For a forest event, I suspect it wouldn't make a difference.
That's some next level planning. My experience of rogaine organisation is more along the lines of 'There's a full moon that weekend so our calendar was planned first (yes even for a daytime event) and we've had it on a Saturday for the last two years so a precedent has been set and we're not budging'.