Grant and Lincoln's invitation

[RJNorton]

I don't know, Linda, (it appears he wouldn't, though, if Mary's note is accurate) but this brought another question into my mind. Is there any record of the conversation between Mary and Grant as they rode together in the carriage on the night of the 13th (for the grand illumination)? Did Mary talk to Grant about going to the theater the next night? If she did then Ulysses and Julia might have talked about it when they met back in their room at the Willard later that night. Is it possible the Grants were working on "excuses" as early as the night of April 13th?