| Date | Conference | Sponsorship deadline | |
| 01 – 08 August 2026 | 46th Committee on Space Research 2026 Scientific Assembly (COSPAR 2026) – Italy | Closed | |
| 10 – 14 August 2026 | Solar Magnetohydrodynamics Conference (Solar MHD III) – Spain | Closed | |
| 01 – 02 September 2026 | Space For Inspiration – Annual Conference on Commercial Space Exploration 2026 – Denmark | Closed | |
| 16 – 18 September 2026 | PLAnetary Transits and Oscillations of stars 2026: Confronting Exoplanets Across Time and Space (PLATO ESP) – United Kingdom | Closed | |
| 28 September – 02 October 2026 | ESA International Conference on Guidance, Navigation & Control Systems and International Conference on Astrodynamics Tools and Techniques (ESA GNC & ICATT) – Spain | Closed | |
| 28 September – 02 October 2026 | RADiation and its Effects on Components and Systems Conference* (RADECS) – Czech Republic | Closed | |
| 30 September – 02 October 2026 | 39th IEEE International Symposium on Defect and Fault Tolerance in VLSI and Nanotechnology Systems (DFTS) – Italy | 20 August | |
| 01 – 02 October 2026 | ESA/CNES Space Cost Engineering Conference 2026 (SCEC) – Netherlands | Closed | |
| 06 – 08 October 2026 | European Space Thermal Engineering Workshop (ESTEW) – Netherlands | 1 September | |
| 05 – 09 October 2026 | 14th European Space Power Conference (ESPC) – Portugal | Closed | |
| 13 – 16 October 2026 | 6th Space Passive Component Days (SPCD) – Netherlands | Closed | |
| 21 – 23 October 2026 | Artificial Intelligence in and for Space (SPAICE) – Netherlands | Closed | |
| 20 – 22 October 2026 | 14th International Association for the Advancement of Space Safety Conference (IAASS) – France | Closed | |
| 2 – 6 November 2026 | European Space Weather Week (ESWW) – Italy | Closed |