Schools, businesses and community groups that are tackling single-use plastic waste are being recognised at a special reception.
Surfers Against Sewage are formally certifying the island as Plastic-Free.
The States Assembly's getting 'Plastic-free Parliament' status for ditching cutlery, straws, bottles and cups.
It's also demanding firms that provide the government with refreshments to the do the same.
You can find out more about the 'Plastic-free Communities' programme on the Surfers Against Sewage website.