Read it through once

Forty-eight hours later the unbelievable had happened; every one had refused the Mingotts' invitation except the Beauforts and old Mr. Jackson and his sister. The intended slight was emphasised by the fact that even the Reggie Chiverses, who were of the Mingott clan, were among those inflicting it; and by the uniform wording of the notes, in all of which the writers "regretted that they were unable to accept," without the mitigating plea of a "previous engagement" that ordinary courtesy prescribed.