So, does anyone have any idea how many CAL fans are going to Auburn for the football game? I'm thinking of moving to the research triangle in April and will wait until next football season to go to football games on the east coast.

There may be more than you expect, lots of Cal alum on the east coast. The next couple of years are going to be a treat for East Coast Bears going to new game day experiences (West Coast Bears as well).
New England and the Mid-Atlantic in the fall are a lot nicer than LaLaLand.

On par with Ole Miss and Tennessee in 06.
I'd say about 10-15k