As it currently stands, the dates for the 2018 Ontario High School Chess Championship (OHSCC) and the 2018 Ontario Youth Chess Championship (OYCC) are in conflict.

Both events are scheduled for the second week in May. The OHSCC is planned for Toronto Fri May 11 - Sat May 12,
while the OYCC is planned for Kitchener Sat May 12 - Sun May 13. There is a one-day overlap.

Both the OHSCC and the OYCC have the Ontario Chess Association as sponsors and partners, for their respective events.

The OHSCC set its event dates in November, 2017, some four months ago, and informed chess organizations around the province. There was no disagreement. Its organizing group booked the hall, and set up a plan for player accommodation at that time, for out-of-town players.
Meanwhile, the organiser for the 2018 OYCC, IA Patrick McDonald, recently set his dates, in full knowledge of the OHSCC plans, as being the only ones possible where he could obtain the hall to hold his event. (Could other halls, and thence other dates, have been considered? One would think so.)
The OCA has signed off on the conflict, to the detriment of both events.

This is an unfortunate situation for Ontario's junior players, and their teachers and parents.
These two championships should be several weeks apart, so that players might be able to play in both.
Needless to say, both events will lose, as players are forced to choose between them.

The OHSCC, having been first held May 10-11, 1968, is celebrating its Golden Anniversary on May 11-12, 2018.
For more details, and to see why your school should participate, please visit http://www.ohscc.on.ca or email high.school.chess@gmail.com .

Christopher Field and Doug Breckman, Organisers;
Emidio Iacobucci, Treasurer.
Ontario High School Chess Championship Organising Committee.