Calendars 5 allows to open a map when a Location is assigned to an event. To do that tap the event and then tap the location link.
To change the map you want to launch, when tapping a location on the event, follow the steps below:
After that, once you tap on the link, the appropriate map app will be launched.
N.B. You need to have Google and Yandex maps apps installed to be able to select them in the settings.