The Sefer Hamitzvot of the Rambam Mitzvah 52 and 53.

The commandments 1. to bring a "Chagiga" (festive) offering when you go to the Bait Hamikdash on the chagim festivals. 2 to go to see and be seen in the Bais Hamikdash on The 3 Chagim (festivals) with a Reia offering.