| 27 June 2020 | Committee Meeting |
| 01 July 2020 | Copy deadline for Subterranea 54 |
| August 2020 | Subterranea 54 published |
| 06 September 2020 | Site Visit to Dumpy Level, Dover Castle Members-only event, booking required via self-service |
| 17-18 October 2020 | Autumn Meeting, AGM & Visits, Northamptonshire |
| 24 October 2020 | Committee Meeting |
| 01 November 2020 | Copy deadline for Subterranea 55 |
| December 2020 | Subterranea 55 published |
| 20-27 August 2020 | AIA Annual Conference, Liverpool |
| September 2020 | Open Doors, Wales |
| 05-27 September 2020 | Doors Open Days, Scotland |
| 11-13 September 2020 | Bristol Open Doors |
| 11-20 September 2020 | Heritage Open Days, England |
| 12-13 September 2020 | European Heritage Open Days, Northern Ireland |
| 14-20 September 2020 | Glasgow Doors Open Days |
| 19-20 September 2020 | Open House London |
