From Environment Canada’s website, 5pm Friday:
Dangerous winter driving conditions are expected on untreated roads Saturday and Sunday.
Surfaces such as highways, roads, walkways and parking lots will become icy, slippery and extremely hazardous. If you must travel, keep others informed of your schedule and destination and carry an emergency kit and mobile phone. Beware of branches or electrical wires that could break under the weight of ice. Extended and widespread utility outages are possible. For information on emergency plans and kits go to http://www.getprepared.gc.ca/
If it is too dangerous to travel to the event tomorrow, I expect UCR to either issue a refund or at least a credit towards a future event.