The Common Ground Music Festival starts Monday; there will be 24 main stage performances over seven days.
Of course the flow of traffic downtown will change, but city officials said they are not expecting any problems.
"There's usually not a lot of congestion once people figure out the detours and the fact that the roads are closed," said Andy Kilpatrick, a transportation engineer for the city of Lansing.
Grand Ave. between Shiawassee and Saginaw, and Shiawassee between Grand and Cedar will be completely closed. There will also be lane reductions: Saginaw between Capitol and Cedar, and Grand between Michigan and Shiawassee.
Also, Shiawassee between Grand and Capitol will be a one-way street moving westbound.