Just to help get it all in one place...
Parade route: Fenway Park - Ipswich St. - Boylston St. - Tremont St. - Cambridge St. - Blossom St. - Charles River. Map:
Start time: 10:00am (Earlier events in Fenway Park.)
Route streets closed: 9am - 1:00pm
Parking ban: From 12 midnight tonight along route and some adjacent streets
MBTA "T" and Commuter Rail announcement:
Bowdoin (Blue Line) will be open on a weekday schedule 5:15am to 6:30pm.
At least "T" Green Line Arlington and Copley stations will be closed during the parade. Closure screens were pre-positioned by them on Friday. (Not mentioned in the bulletin.)
Commuter Rail: While there will be more and longer trains on the regular Saturday routes, there will not be service on routes that are not regularly served on Saturdays.
Otherwise, purchase tickets online for $10 round trip!
These are from MBTA/MBCR alerts and Boston.com (I am not an official.)
A personal survey of Boylston St. Friday also indicated:
Restaurants and bars along and near the route will open at 8am.
Banks will open at 12 noon.
Go Red Sox!