Inform events away form the location
Allow users to contribute without necessarily being at the coordinates informing closed streets, periodic events.
Carnival in Brazil with some streets can be closed. The city of Rio de Janeiro adopts Waze and report in Waze when great events works, but the user can contribute in a more limited platform in the mobile client, without using the full map editor.
Events are common as street fairs, marched, parties, rallies, strikes...