Simple!!
When u walk in.
U can either make it dramatic or v- formal.
Dramatic would be, like hosts of tv shows, where u walk in and
shout. "good eveningggggggggg everyone!"
then after that u guys introduce urselves separately
i m ______, im _________, im ___________ im ________ and i m
__________
then together say, together, we will be the emcees for tonite's
event.