There is a way.
Pictures!
1. Put an image file displaying the text (or whatever) you want in your game's picture folder.
2. Make a parallel event somewhere in the map you want the picture to be displayed (So, make a new event in town in your case)
3. Using the show picture event command, select the image file and set the coordinates to make the picture appear in the top right (I can't remember the exact coordinates for that so trial and error your way with the picture until it appears where you want)
4. Still in the show picture event command, check the box that says "picture scrolls with map"
There youg go! Though, if I remember correctly, the picture will remain if you leave the map. so to fix that just put the event command erase picture [1] or whatever number you chose to correspond with your picture (default is 1) in every teleport event you have leading out of the map.