Here's the schedule for WDC in Columbus, according to the ORIGINS event list:

WDC
Round 1 - Thursday 6 PM
Round 2 - Friday 6 PM
Round 3 - Saturday 9 AM
Round 4 - Saturday 6 PM

WDC / Dipcon Hobby Meeting (and awards ceremony, presumably) - Sunday 10 AM

Mentor Rounds (2 hours each):
Thursday 4 PM
Friday 4 PM

Variants
Wednesday 8 PM
Thursday Noon
Friday 10 AM
Friday 2 PM
Sunday 10 AM (who scheduled this at the same time as the meeting?)

Note that, for some strange reason, they don't list exactly where each  event is being held, like they do with the other events...