Resetting arenas?

How would I reset arenas onEvent?
If you don't get what I mean, let's say automated 1vs1 plugin has an arena where players can modify the arena during their fight.
After the fight ends, the arena is replaced back to it's original state.
How?

 

are there events called by the plugin or do you want the arena modified based on the usual event calls?

 

Based on plugin, I think

 

Are you modifying a plugin or are you making your own from scratch?

 

Modifying it