The Most Wuthering Heights Day Ever is a global event that takes place annually in various cities around the world. The event is inspired by Shambush's The Ultimate Kate Bush Experience, which took place in 2013 in Brighton, United Kingdom. The event aimed to set an unofficial world record for the most people dressed as Kate Bush in one place, with hundreds attending. In 2016, The Most Wuthering Heights Day Ever event was proposed to be held in at least 16 places worldwide, including Adelaide, Perth, Northern Rivers, Sydney, Tel Aviv, Montreal, Atlanta, Copenhagen, Berlin, Uppsala, Wellington, Hobart, Amsterdam, and Somersworth. Shambush! hosted an event in London and helped organise the largest event in Melbourne. An event was also hosted in Christchurch, New Zealand.

The event is run by an autonomous collective of city-based volunteer event organisers on a non-profit or for-charity basis. The Most Wuthering Heights Day Ever event is run exclusively for charity on a not-for-profit basis. The event in Mapleton, Queensland, for example, was in aid of charity, and their chosen first charity was DV Safe Phones.

The event involves participants recreating the music video for Kate Bush's 1978 song "Wuthering Heights." Participants dress up in red and dance to the song, recreating the iconic dance moves from the music video. The event is open to everyone, regardless of age, gender, or dance ability. The event aims to bring people together to celebrate Kate Bush's music and to raise money for charity.

The Most Wuthering Heights Day Ever has gained popularity over the years, with hundreds of people attending events in various cities worldwide. The event has been covered by various news outlets, and pictures and videos of the event have been shared widely on social media.