Traffic from Western Mass to Boston on 90 and parking (Friday, 25th)?

Heading into Boston, today technically (the 25th), on 90 from Western Mass. I'll be leaving some time between 3 and 4:30pm, but I'm at the whim of someone else's schedule so I don't know if it will be early or later. We're trying to make the Celts game at 7:30. Is traffic going to be killer if I'm driving in from 4:30-6? How long can I expect to add on to my time? Previously I've parked in Newton and taken the commuter in, but I don't think that's an option this time because of time. Any ideas for parking? I'm staying overnight, and then leaving in the early afternoon Saturday (26th). Any ideas for where I can stash a car for that long somewhere near South Station?

I appreciate any help, thanks.

Well if you ar egoing to the celts game.. Then you want NORTH station. There are garages (one great one is on the corner of PRINCE ST) literally 2 blocks from the TD banknorth garden and probably ovr night will cost you about 30 bucks.
I think you will be FINE with takin the Pike at that time of day, know why? Because youll be going against all the traffic. Everyone leaves Boston at that time, hence they jam up I-90 West bound.. but 90 East is fine.
Good luck, have fun.. the garage on the corner of Prince St is conveniently marked in HUGE letters, PARKING. you cant miss it..

Try here, it's a pretty good map.
http://www.boston-vacation-hotels.com/bo...