According to Kirstein's Wikipedia page, he kept a diary for about 20 years (1919 until the late 1930s), so you were too late to be included in that, @Charlie. The question is, did you include Kirstein in your daily journals and/or the autobiography you have mentioned?
Lincoln Kirstein (1907-1996) in 1930, at 23, by Jay Leyda:
And in 1948, at 41, by George Platt Lynes: