Outdoor events, especially on summer nights, can be magical. But we are in the British Isles, and it sometimes rains here. Bad weather becomes part of the folklore of big festivals, but for small events, whether it's family fun days, live music or summer fetes, bad luck with the weather can ruin months of hard work.

For hannah festival, architect Paola Zanotto has designed a temporary roof for Millennium Square. The structure is inspired by the mechanism used on sailing boats, so it is easy to close when it rains and open again as soon as the sun breaks through.

Event organised by Paola Zanotto @paolazanotto Hannah Directory Andrew Wilson