7 files declare their use of MapRenderEvent in farmOS 2.x

FarmMap.php in modules/core/map/src/Element/FarmMap.php

MapRenderEventSubscriber.php in modules/asset/land/src/EventSubscriber/MapRenderEventSubscriber.php

MapRenderEventSubscriber.php in modules/asset/structure/src/EventSubscriber/MapRenderEventSubscriber.php

MapRenderEventSubscriber.php in modules/core/map/src/EventSubscriber/MapRenderEventSubscriber.php

MapRenderEventSubscriber.php in modules/core/quantity/src/EventSubscriber/MapRenderEventSubscriber.php

MapRenderEventSubscriber.php in modules/core/ui/map/src/EventSubscriber/MapRenderEventSubscriber.php

MapRenderEventSubscriber.php in modules/core/map/modules/mapbox/src/EventSubscriber/MapRenderEventSubscriber.php