Sacrifices were offered: Yearly
Source: TTT
Leviticus 16:3
This is how Aaron is to enter the Holy Place: with a young bull for a sin offering and a ram for a burnt offering.
1 Samuel 1:3, 21
Year after year Elkanah would go up from his city to worship and sacrifice to the LORD of Hosts at Shiloh, where Eli’s two sons, Hophni and Phinehas, were priests to the LORD. / Then Elkanah and all his house went up to make the annual sacrifice to the LORD and to fulfill his vow,
1 Samuel 20:6
If your father misses me at all, tell him, ‘David urgently requested my permission to hurry to Bethlehem, his hometown, because there is an annual sacrifice for his whole clan.’