So here's the idea. Admins type /events and the new menu pops out with the list of the events and when he click on one of them another window pops out with event rules and prizes. Next, when he choose the event by clicking on "make event" button or something like that he will be teleported to the place where that event will be organised. Admin can call players by announcing on the screen which event has been started and what's the prize so players can join by typing /ejoin. If it's not DMing event when players join they will lose their weapons.
I have a lot suggestions for the events but I will post them after you guys reply on this idea.