I agree. I have MC'd many events and have sang on stage in public, and each time I go up to that mike the butterflies start. But, I did learn long ago, that especially with doing MC work, the best thing you can do is something funny to open.
Once the audience relaxes, then, you too will find that it is a little easier to proceed with your agenda.
Another trick is to try not to look directly at the audience. Try to look a bit above their heads (if they are seated), but just enough for them to think that you are looking at them.
Then, there is always the old "picture everyone naked" trick.
The best thing to do is give yourself a good pep talk - and just be yourself. That works great too! Good Luck