"The previously mentioned alewife method is the easiest and cheapest method i know, short of having a friend with a parking space you can use in the city. so, you could do a big drop off, and then shoot the car over to alewife, and come back on the T. more "annoying" but more peace of mind generally."

I don't think the Alewife thing will work - the T doesn't run late enough for us to get back there to our car. We can't sleep over at Arisia since he have a diabetic cat to shoot with insulin at 6:30 AM in Framingham :)

Friday night I'm sure we'll be fine - I just have to find a place where we could leave the car from 1 or so in the afternoon on Saturday until we leave the hotel early Sunday morning.

Thanks for the info on the vouchers!