This is May-day and a holiday so Clara has no school. She has invited several ladies to take tea this afternoon and is occupied during the morning making preparations. Her rooms are inconveniently small, but by arranging the school room and setting the table there we shall do nicely. The ladies who came were Mrs. Sullivan a native of Tennessee and her widowed daughter, Mrs. Mills, both thought to have a warm side toward the south. Mrs. De Levie, Miss Eunice Hooper, Mrs. Lewis and Miss Elizabeth Lewis, Mrs. Bradley, Mrs. Tyler, Mrs. Bacon, Mrs. Brigham, Mrs. Kirkpatrick, one of Clara's scholars who has lately been married, Mrs. Ayers from Ohio, and Mrs. Sibley a Connecticut lady whose husband is an elder in the Presbyterian Church of Pana but is now in the army under Gen. Steel.
I haven't been able to find out why May Day would be a school holiday in 1862. It wasn't connected to organized labor until later. I can't imagine a school holiday to celebrate and do a May pole dance. I found one reference to May Day connected to the feast of Mary, a religious holiday.