Stay somewhere up High St closer to the Ohio St campus. School is out then, and the hotels will have space. You can hop the #2 bus down High St and there's like 3-4 stops along the side of the convention center you can use. The #2 bus runs every 10-12 minutes or so, and is a well-used and well-traveled line. It's about a 10-minute ride (maybe) from campus to the convention center on that bus.