A May Day to Remember: March in Support of Willow Grove Green Ban Willow Grove is set to be relocated in favour of the construction of a second Powerhouse museum. Photography by Vivienne Guo May 1, 2021 A coalition of trade unionists, activist groups and students have used this year’s May Day to protest against the dismantling of Willow Grove, an 19 th century heritage building in Parramatta. Willow Grove is set to be relocated in favour of the construction of a second Powerhouse museum. May Day, or International Workers Day, is a rally held annually to support workers and express solidarity to the labour movement. Though the event normally takes place in the city, this year it was held in Parramatta for the first time in its history. The move, proposed by the Construction, Forestry, Maritime, Mining and Energy Union (CFMEU), aimed to express support for a green ban on Willow Grove. A green ban is a form of strike action where members of a trade-union refuse to work on a project because of environmental or heritage concerns.