Its better if you call the red sox ticket office they will assist with those accommodation.
There are many lots around that are close and have handicapped accessabilities. Depending on where your tickets are would be where you should park and enter the park. You can call Red Sox/Fenway to figure it bnb out. Parking will cost.
They have parking within the stadium for handicap. You call guests services and they will also accommodate tickets that are more accessible as well
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