Hello fellow tappers,
This only works if you have just been awarded the Prison.
This is done during the end dialogue of Montgomery Burns State Prison Pt. 1 quest.
If you exit the game during the dialogue that appears after the first Felon spawns, when you re-log a second will have spawned.
Please also remember to force close the game before opening it again to ensure this works.
You can get more by letting the dialogue advance one more and exit the game and re-log.
This is a neat little trick to help you reach the goals in the event.
Hope you enjoy this little trick, and happy hero-tapping!