As Jasper Ave work wraps up right away for the year, I think that will be the best bet for vehicle traffic east/west - vehicle traffic has been prioritized for Jasper Ave but there will also be 99,100, 103, 104 Ave.
When people drive dt for Oilers games, as an example, many choose to park a little further away to avoid the congestion (and cost) that results with so many cars in a smaller area with traffic lights on every block. It's a recipe for gridlock. I went to a 1,000 person event a few weeks ago at River Cree and it took 20 minutes just to move a few hundred meters to get out of the parking lot.
I'd love to see more people plan to take transit or park further away and walk 10 to 15 minutes then have to drive to the closest available spot to the arena (save that for people with less ability to walk further).