Up to 5,000 revellers will take over a mid Wales town on Friday, with some famous faces expected.
Revellers pull out the stops - and the wigs - for Llani fancy dress
Llanidloes will be one of the only places where you are likely to spy James Bond, Fred Flintstone, Austin Powers and Alan Partridge all in the same street.
Llanidloes Fancy Dress, one of Wales' largest street parties, celebrates its 35th anniversary this year.
The town almost doubles in size for the weekend, with local residents swelled by visitors from across England and overseas in a celebration of the art of dressing up.
A funfair, live music, costume judging and a community centre party are all part of what townspeople call 'Llani Fancy Dress.'
Sarah Garside, secretary of the fancy dress committee, said: "The committee organises the street party, but there's also judging and a party in the town's community centre.
Yeh baby - crushed velvet suits are common at Llani Fancy dress
"This year there'll be a Samba band in the street and there'll be live music at the Great Oak Cafe.
"We're again expecting up to 5,000 party goers and they're always good humoured."
She added: "It's a great advert for the town and it really benefits from the fancy Llani Fancy dress.
"People travel from throughout Wales to fancy dress and there are also people from the Midlands, Brighton, London and even some from overseas.
Thousands gather in Llanidloes for what locals call 'fancy dress'
We've messages on our website from as far away as Australia too."
The market town is usually a scene of quiet, rural harmony with a population of about 3,000 people.
The annual festivities begin at 1800 BST on Friday when the town is closed to traffic and everyone takes to the streets.
Judging, by members of the town council, starts an hour later.