The updated OUSA website recently added back the Rogaine event calendar
, found from the Events > Calendar page (scroll down to local events for the link.https://orienteeringusa.org/events/calendar/rogain...
Heidi Cusworth will be maintaining this calendar (as before, with backup from the OUSA webmaster) which can also be used by Canadian Rogaine organizers to list their events. Sanctioned Rogaines (usually championships) will appear on the main orienteering calendar so look for US, North American, and World Rogaining Champs there.
Expanded Rogaining information is found under the heading Explore > What is Rogainng.
When you also add your event on Attackpoint, they'll appear on the local event finder map