Boston Musical Fund Society concert. Here is the program for the concert that he attended.

This is probably Margaret Craig, one of the two Craig sisters from Ireland who were servants for the Faxons. It is not clear how this messaging process worked. Did a friend of Mary who was traveling to Boston from Brookfield somehow drop the note at the Brookline Village train stop? Did Margaret pick up letters and messages during daily visits to the post office (in the train depot)?

Not sure why Adeline is referring to her sister with her maiden name.