Deuteronomy 16:2, 6, 16

As the sacrifice for the Passover to the LORD your God, offer an animal from your flock or herd at the place the LORD will choose to be worshiped.

but offer it in the place he will choose to be worshiped. Offer it in the evening as the sun goes down, which is when you left Egypt.

All your men must come before the LORD three times a year to the place he will choose. They must come at these times: the Feast of Unleavened Bread, the Feast of Weeks, and the Feast of Shelters. No man should come before the LORD without a gift.