Ummm, you could make a blank square on your tileset and change its terrain tag, then place it in a circle around the events, then make a common event that runs whenver the player steps on that certain terrain tag(unloading the image from memory id assume)
OR
have the player touch event run a selfswitch to a new page and have a paralell process that checks a conditional branch to see if the player is presing up down left or right, then removing the picture, and reseting the self switch.
hopefully thats enough to go on, if you have trouble let me know, I'm not the greatest at explaining things coherently.