Since 2011, the Town of Cottesloe has co-hosted a combined Citizenship Ceremony and Awards event with the Town of Mosman Park and the Shire of Peppermint Grove.

In 2022, the Australian Government updated the Code to give councils greater flexibility, allowing ceremonies to be held on 26 January or within a three-day window before or after that date (any time between 23 January and 29 January). The three Councils continued rotation of hosting responsibilities, including setting the date of the celebration.

Since the change, the Town has held its citizenship ceremonies on the following dates:

• 26 January 2023 – Hosted by the Town of Cottesloe in partnership with the Shire of Peppermint Grove and the Town of Mosman Park.
• 27 January 2024 – Hosted by the Town of Mosman Park, who independently chose to hold the event on 27 January, again in partnership with the Shire of Peppermint Grove and the Town of Cottesloe.

In July 2024, the Shire of Peppermint Grove resolved to establish a new biennial event, to be held every two years in October. As a result, the Shire advised the Town of Cottesloe that it would no longer participate in the joint Australia Day citizenship ceremony from 2025 onwards.

In 2025 the Town held an event (hosted by the Town of Cottesloe only) on 26 January.