festive food; seasonal celebration food
Refers to traditional dishes prepared for specific annual events such as New Year, Setsubun, or the Doll Festival.
During New Year's, we eat festive foods like osechi.
Speaking of Setsubun festive food, ehomaki is famous.
Regional cuisine, not tied to a specific calendar event, whereas 行事食 is specifically for seasonal celebrations.
Compound of 行事 (event, function) and 食 (food, meal).