Help Event Spoil

Hello brothers, I'm looking for a help! a while ago I saw on a server 1 MOD where it was an event being the dwarf character, spoil, and who wanted to participate in this event signed up and was teleported to a specific location, just to kill and kill the mobs. where this event had an automatic duration of 60 minutes. could someone help me develop this mod? since my experience in creating java MODs is very low! I appreciate the opportunity.

sorry my bad english, but is translate in google translate.