| Session 26 (Geneva, 8-9 January 2019) | 26 | 2019-01-08 |
| Session 27 (Ispra, 19-22 February 2019) | 27 | 2019-02-19 |
| Session 28 (Geneva, 26-29 March 2019) | 28 | 2019-03-26 |
| Session 29 (Geneva, 21-22 May 2019) | 29 | 2019-05-21 |
| Session 30 (Web conference, 20 September 2019) | 30 | 2019-09-20 |
| Session 31 (Los Angeles, 15-18 October 2019) | 31 | 2019-10-15 |
| Session 32 (Web Conference, 4 December 2019) | 32 | 2019-12-04 |