Rather than flooding the entire map with events just to run a single common event, bind common events to terrain tags that trigger upon stepping on them. This will cause all of the tiles marked by those terrain tags to spring up the common event when the player steps over them.
Bind common events to trigger upon stepping on tiles with specific terrain tags.
<event x: y> <event x: y, y> Sets the tiles marked with terrain tag y to trigger common event x. The common event will run each time the player steps over a tile with the respective terrain tags.
— And that’s all, folks! —