Thanks all for your advice and suggestions.
I called the MVP desk and they assured me that with my status I should not be bumped. They did suggest that I get to the airport as early as I can - advice which I will certainly take. As soon as I get there I'll find an agent and get this straightened out. The MVP agent did say that I am confirmed on the flight.
I can't purchase another ticket - we got put on travel lockdown after I bought this one. I also don't really have time to take a connection - I have to be up so early for my presentation that I have to get to Boston as quick as I can and then drive to Nashua, have dinner, and go to bed. As long as I have a good chance of getting on the flight I will stick with this one.
But at the first signs of trouble tomorrow, I will be asking some very pointed questions about how AS plans on getting me to Boston tomorrow evening.
I'll let you guys know how it goes!