Past:
- 6-8 November 2023, PTOLEMY Collaboration Meeting, Princeton, NJ USA
- 26-27 June 2023, PTOLEMY Collaboration meeting, LNGS Italy
- 6-7 October, 2022 -PTOLEMY Collaboration meeting (The Netherland, Amsterdam (Zandvoort))
- 1-2 July 2020 – PTOLEMY Collaboration meeting (not at Naples)
- 2-4 December 2019 – PTOLEMY Collaboration meeting CIEMAT-Madrid, Spain
- 19-21 June 2019 – PTOLEMY Collaboration meeting
- 26-28 November 2018 – First PTOLEMY Collaboration meeting – LNGS
- 11-12 December 2017 – Kick off meeting of the PTOLEMY Project – LNGS