OK, if you're coming from points east here is the best place to park period. I come from Rochester. Actually party at the Hammer lot and sometimes park there if I plan to stay after the game. If I want to go home after, this is where to park and is also a decent place to party:
90 east to exit 48A
take 77s (right after exit) to 20A east (NOT 20). This is a flashihg light.
20A east to Orchard Park. In Orchard Park there is a traffic light (could be the first) with route 178 - take right. 2nd left is Taylor (general Taylor, private taylor, something taylor) - take left. Continue on as it bears around to the right through the underpass. First left past the underpass is Ellis. Take Ellis to the end - California. Park at second lot on left. $10. Takes 1 hour 45 min to make this trip from Rochester at 3 AM, but leaving a Bills game it takes the same time. Extra 15 miles but it is worth the distance to avoid the traffic after the game. Big down hill and uphill climb from the lot to the game, probably 10 minutes, never timed it.
At any rate if you want an easy out to points east after the game this is where you want to park.
Oh yeah, reverse these directions on your return.