Here is a recording of a route to get to Glacken Park from Davis Square. Depending on where you live a portion may be relevant to you. Keep in mind Alewife Linear Park is closed for reconstruction.
You can download ridewithgps app and get turn by turn directions.
Some of us will do this to get there probably passing through Davis at 9:20something. If you don't mind going on the early side and want to join reply so we know to look for you.