Midrash for Chagigah 11:2
אמר ליה אביי עד הכא דמיחייבא אימיה בשמחה אייתיתיה אימיה מכאן ואילך אם יכול לעלות ולאחוז בידו של אביו מירושלים להר הבית חייב ואי לא פטור
Abaye said to him, Until this point, since his mother was obligated by the law of rejoicing, his mother brought him. From there on, if he can go up, holding his father's hand from Jerusalem to the mountain of the Temple, he is obligated. And if not, he is exempt.
Sifrei Devarim
R. Yossi Haglili says: Three mitzvoth obtain on a festival: the festive offering (chagigah), the sacrifice of peace-offerings, viz. (27:7) "And you shall sacrifice peace-offerings and you shall eat them there"; "appearance" (re'iah), before the L-rd with a burnt-offering, viz. Shemoth 23:15); and rejoicing (simchah).
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