Time to shine?

Last week, I was told by my head nurse that being part of the education committee, I am tasked to host the upcoming symposia in the hospital. I have tried my hardest to talk her into considering others to do the job but she did not buy it.
Last night, she handed to me the invite and my name is written on the it as the master of the ceremony.
I am now panicking as I have no experience doing a hosting job. I have a stage fright and I always suck at interviews.
To top it all, I am also leading the invocation.
Oh crap!