Many groups have called on the federal government to make June 21 a national holiday, so that all Canadians can celebrate and learn alongside Indigenous communities. We aren’t there yet, unfortunately (something to bring up with your Member of Parliament!) But all who are able to take some time to attend events the week of June 21st are encouraged to do so as an act of education and reconciliation.
The Office of the Treaty Commissioner has a number of events listed, many of which include local United Church participation: http://www.otc.ca/events
Saskatchewan Aboriginal Friendship Centres offer many events as well and can help direct you to local events: http://www.afcs.ca/