Key dates and events in the proposal process are shown below. The Phase I and Phase II deadlines are highlighted.
| Date | Event | Comments |
| (varies with participant) | Proposal deadline | Proposals received by National Gemini Offices (NGOs). |
| Late April/Early May (set by participant) | NTAC meetings | Scientific assessments by each Gemini participant ("National TAC"). |
| 11 May 2020 | E-transmission | Electronic transmission of proposals to Gemini from NTACs. |
| 28 May 2020 | ITAC | International Time Allocation Committee meets to resolve issues and recommend programs. |
25 June 2020 |
20B schedule and Phase IIs available | 2020B OT templates available to PIs. |
| 1 July 2020 | Phase II reviews start | The response time is 7 days for checking by NGOs (from "For Review") and by Gemini CSs (from "For Activation"). |
| 20 July 2020 |
Phase II deadline | PI deadline for submission of completed Phase II Programs to National Offices (earlier submission is encouraged). |
| 1 August 2020 | Start of semester 2020B | 2020B programs may be observed earlier to fill queue nights. |