Or just ask for a mini-event, when one of the admins is ingam. I like to do some events, so I'm happy to help out. People ask for an event, and if I have time, I set one up, and do some.. Simple as that. and if the server would have "event hosters" you'd also have to wait for them to be online, which odds are less likely, than an admin being online (who likes to do mini-events)
Or as Champion said, think hard, and create an original event yourself, and the admins will be very happy to help you.