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In page Smith College:

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Until the early 1990s, all alumnae reunions were held during Commencement weekend. However, as the number of returning alumnae grew beyond the capacity of the campus, reunions were split into Reunion I/Commencement Weekend and Reunion II, held the following weekend. "Significant" reunions (50-, 25- and 10- year, but also 2-year) and the earliest reunion classes (65-year and prior) are assigned to Reunion I; other reunions (5-, 15-, 20-, 30-year, and so on) are assigned to Reunion II.