The Letchworth Garden City Vegan Market takes over Leys Square, right in the centre of the town, on just one day each year. The event brings together up to 25 stalls including a huge variety of vegan street food vendors, artisan bakers, craft brewers, ethical jewellers, sustainable chandlers, local artists, zero-waste champions, environmental charities and loads more.

Ley's Square hosts the town's monthly farmer's market, as well as their other major annual events, drawing in crowds from across North Hertfordshire and South Bedfordshire. The event is run in collaboration with the local BID team and the Garden Square Shopping Centre who support enormously with local promotion.