Change to party plans.

  "There has been a change of plans regarding my Birthday Party the weekend of the 26th. Staurday's party will continue as previously planned, however our traditional post-party Sunday Brunch has been canceled. This is due to not realizing 'sunday easter dinner' with my family is happening at 1pm and not in the evening as I thought.
  So to repeat, party still on for Sat, brunch canceled for Sun. I might go out to the diner earlier that morning, but I can't plan on it."