I think our best chances for Gameday at all are:
Week 3 @ Florida
Obviously a big matchup. I think Gameday will probably be there, the only other big-time matchup that week is Florida State at Boston College.
Week 4 @ LSU
If we win at Florida, then it should be a toss-up between this game and Iowa at Ohio State. If we lose at Florida, it will be Hawks vs. Bucks for sure.
Week 10 @ Notre Dame
There really don't seem to be too many big matchups this week. Stanford at USC and Texas A&M at Texas Tech seem to be the only two games that could compare.
Otherwise, too many Marquee matchups on the Third Saturday in October (Texas Tech @ Texas, Michigan @ Iowa, Auburn @ LSU) to really hope for a Gameday game.