Fatal error

Hello,
I put together our Church website for Zoarchesterfield.com It was up and running for two years until last week when I automatically upgraded the Events calendar plugin and I got the fatal error message. Now I cannot login any more. I have had to create a new user just to be able to ask for help. I contacted Go Daddy and they said they could fix it for $150.00.
Can anyone help me get to my Dashboard to see if I can eliminate this plugin to start with?
Bob