What: A massive parade through the streets of New York that anyone in costume is welcome to join.

Where: New York City, up Sixth Avenue.

When: October 31.

Why: The ancient Celts used to think that around October 31, as winter approached, the dead might pose problems for them, so they donned a mask and slaughtered cattle. This later grew into the Christian celebration of All Hallows’ Day (aka All Saints’ Day)

Do it because: It’s not often everyday punters get the chance to march in a parade watched by millions. Halloween is a great time to be in the US – it’s a huge celebration there.

How much: Free.

See halloween-nyc.com