I've only really emceed one event, that being SCRIW last year. The biggest thing I learned from doing it?
Get in shape. I'm not exactly all that fit, and I went all day as emcee and game announcer (in addition to my other duties with the event). The next day, I barely moved because I was so sore. If SCRIW were a two-day event, I wouldn't have made it.
Now granted, I was doing my fair share of running (with a side order of woefully-inadequate-compared-to-Karthik jumps towards the wall to slow down on the other side). It's possible to dial it back and still be effective. Know your abilities, know your limits, and know how long you have to last.
