Partial Source: The Wrestling Observer

WWE plans to have the locations for both WrestleMania 31 and 32 set in August, and will reveal them to the host cities that successfully bid on the event at that time.

The Detroit Sports Commission has submitted a bid in hopes of hosting either WrestleMania 31 or 32. Detroit previously hosted WrestleMania 23 at Ford Field, which is where the event would take place if it returns to the city.