“Three times a year shall all your men appear before the Lord your God in the place that God will choose [referring presumably to the Temple in Jerusalem], on the festivals of Pesah (Passover), Shavuot (the Feast of Weeks), and Sukkot (the Festival of Booths). They shall not appear empty handed. Each shall bring his own gift, appropriate to the blessing which the Lord your God has given you” (Deuteronomy 16:16).
If you did not get a chance to give your in-person Pentecost offering you can do so here!