Okay kiddo, so the 'obby 'oss festival is a special day that happens every year in a town called Padstow in Cornwall, which is in England.
During this festival, people dress up in costumes and dance and sing in the streets. But the most important part of the festival is the 'obby 'oss.
The 'obby 'oss is a kind of horse made out of a stick frame covered in fabric or fur, with a head and tail. There are two 'osses, one for each side of the town.
Early in the morning, people gather at the 'obby 'oss's stable and sing a song to wake it up. Then they lead the 'oss down the street, dancing and singing as they go.
The 'oss goes through the streets, led by a "Teazer". This person waves a ribbon on a stick above the 'oss's head and tries to catch people in the crowd to dance with them. If you get caught, you have to dance with the 'oss until the Teazer lets you go.
There are special songs that are sung during the festival, and each 'oss has its own song. The whole thing is a really fun and special day for the people of Padstow.