Spring Equinox Celebration on March 25?

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The vernal equinox is March 20.  Normally we would celebrate it on Sunday, March 18.  Unfortunately, I will be in Washington D.C. that day at Rob Keithan's ordination.  We can move the celebration to March 25 or I can give the materials (very detailed) to someone willing to lead on March 18.  What is your preference? - Dennis