Shabbat Shekalim
Begins at sundown on Friday, 21 February 2020 (27th of Sh’vat, 5780)
Shabbat Shekalim (“Sabbath [of] shekels” שבת שקלים) read in preparation for Purim, requests each adult male Jew contribute half of a Biblical shekel for the upkeep of the Tent of Meeting. The Torah portion Exodus 30:11-16 is read. This Shabbat takes place on the Shabbat before the 1st of the Hebrew calendar month of Adar, or on the 1st of Adar itself if it falls on Shabbat. In leap years on the Hebrew calendar, when there are two months of Adar, Shabbat Shekalim is on the Shabbat before the 1st of Adar II (or on the 1st of Adar II itself if it is Shabbat).
Source hebcal