It sounds as if the dates April 11, 2017 and April 13, 2017 should change to May 11, 2017 and May 13, 2017 when May is selected in the control form on the Holiday sheet. If that is the case the formulas for B3 and C3 respectively are:
B3: =DATE(2017,$J2,11)
C3: =DATE(2017,$J2,13)
Let us know if you have any questions.
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