Alberta Health Services has put a stop to a number of sleepovers planned for incoming Grade 12 students at Medicine Hat and area high schools.
In a letter addressed to organizers of the events at Crescent Heights, Medicine Hat, Monsignor McCoy and Eagle Butte High Schools, AHS indicated the events failed to meet mandatory guidelines set out by the province's chief medical officer of health.
"Considerations that have not been met include mandatory physical distancing requirement of at least two metres from every person who is not a member of the same household or cohort," it reads.
"As well as restriction of all indoor social events to no more than 50 persons and outdoor events with no seating to 100 persons. These numbers include attendees, staff and volunteers. Adherence to hand hygiene, illness screening and physical distancing requirements must be maintained during these social gatherings."
The letter indicated that the risk of the events had been deemed "of such significance" that AHS said referral to enforcement would be necessary if it was not informed of cancellations or major updates that would meet requirements.
At least two of the sleepovers have now been cancelled, according to AHS, while one group has been working with officials to make sure the event meets all health guidelines.
In a statement to CBC News, AHS said it understands this can be hard for upcoming graduates who were looking forward to this tradition.
"However, these are extraordinary times with significant risk. We appreciate that the event organizers have revisited the events and are working with us."