From Politico

Romney officials may be uneasy about letting reporters listen to the candidate discuss sensitive foreign policy issues to what is expected to be a largely Jewish crowd given his pledge not to criticize President Obama on foreign soil. Romney has been harshly critical of the president on Israel policy.

Something else potentialy giving pause to Boston: casino magnate Sheldon Adelson, who has given millions to Republicans and pro-Romney SuperPACs but is notably media-shy, is also expected to attend the gathering here