there is one in the Spring but I forget what it is

May 24, Midsummer's Day (First Day of Summer)

I checked the FAQ and there is a link explaining basically the same thing that I said. ( I'm so proud I could remember as much as I did!)

The FAQ says that Candlemas, Feb 2 (not 1st); May Day, May 1; Lamas Tide, Aug. 1; and All Hallows Day (All Saints' Day) Nov. 1; were the quarter days in the old Celtic calendar.