While the positions are very different from one another, I would take most of the requirements for a staff member to be considered for an event member.
All in all, just try to be the best of you. Set yourself a good personality on the server, build up your reputation as a mature, helpful and friendly person, be active, have great passion for the current KitPvP events and the event team by itself, etc.
I hope this should give you a good idea of what at least I see should be the characteristics of an Event Member.