So, daily anti-chess arena doesn't happen on Saturdays? Is it only Saturdays or on Sundays too?
There is a daily Antichess tournament each day of the week but not on Fridays, when there is the weekly Antichess. However,this seems odd, because the daily tournaments are scheduled at 0:00 UTC, while the weekly starts at 19:00 UTC. A daily Antichess on Friday wouldn't interfere with the weekly tournament at all.