Slowthai has announced details of his new one-day festival, Happyland.The event, billed in full as ‘Happyland – The Happiest Place in the Universe’ where “the policy is simple: No Smile, No Entry”, is set to take place at Northampton Cricket Ground on September 25.Happyland’s line-up has been curated by Slowthai himself, with each act “representing a different facet of the UK music scene in 2021”.Slowthai will headline the inaugural edition of Happyland, with sets from IDLES, Beabadoobee, Easy