You get notifications about nearby events or road closures when Google Maps thinks that they might affect a route that you travel often.
If we know about a scheduled event, then you’ll get an alert ahead of time so that you can plan an alternate route. For example, if there is a concert on your way home from work, you might get a notification one day before the concert. Find out how to turn notifications on or off.
Tip: To help you plan around events, tap Get a Reminder and Google Maps will remind you about the event closer to when it starts.