The first event is the Columbus Marathon, which is taking place from 7:30 am until 3:00 pm. The route includes the portion of High Street between the Hyatt and OSU's campus. Here is a link to the map showing the route: http://www.columbusmarathon.com/race-information/course-map.
The second event is a recently-scheduled Moving America Forward rally on the OSU Oval featuring President Barack Obama. Doors open at 5:15 pm, but people may begin arriving even earlier. It is possible that the President's visit will cause some flight and traffic delays.
...I thought we were leaving these problems in DC!