Every year, the trade deadline is on July 31st. In past years, waiver trades were allowed in September, but those will no longer exist this season. So far there have been highs and lows in the Red Sox season, and they clearly have holes that need to be filled.
Those include center field, relief pitcher, and possibly starting pitcher. Also, they can be flexible on what part of the outfield they trade for, as they can move Mookie Betts or Andrew Benintendi to center if needed.
In last year’s World Series run, the Red Sox had numerous contributions made from guys they acquired earlier in the season, specifically World Series MVP Steve Pearce and pitcher Nathan Eovaldi, who had one of the best relief appearances in World Series history.