Leyton's MAS Festival ("MAS" is short for "masquerade") is an informal family-friendly and of course much smaller version of Notting Hill Carnival. Local people of all ethnicities simply gather together to enjoy the music, the costumes, the dancing, the activities, the food and drink and especially the atmosphere, and have a good time. It's very much angled towards the children, who will be in a festive mood having just broken up from school for their summer holidays. The only thing you might need if you attend is a good set of ear-plugs, and maybe a lightweight folding chair.