Knowledge of the rules as I haven't been traveling back and forth for some time.
So I thought that I could find some reference for entry into Canada. Well I haven't found much.
: As a citizen of this country, you do not need a Temporary Resident Visa to visit Canada .
If you plan to visit Canada , you must:
Have a valid travel document, such as a passport;
Be in good health;
Have enough money for your stay. The amount of money you will need can vary with the circumstances of the visit, how long you will stay and whether you will stay in a hotel or with friends or relatives. For more information, ask the Canadian visa office in your country or region.
Convince an immigration officer that you have ties, such as a job, home and family, that will take you back to your country of origin; and
Convince an immigration officer that you will leave Canada at the end of your visit.
http://207.219.111.92/requirements/steps4_1_1.aspx?id=187
As you can see the site hasn't been updated since August last year. It is also quite vague on what will be considered as a valid travel document.
Sorry that I can't help more.
A suggestion might be to contact a US agency that has up to date information.
Wishing you and your group all the best.