Important Dates
| 18 January 2021 | Registration re-starts | |
| 1 May 2021 | Abstract submission re-starts | |
| 31 July 2021 | Abstract submission deadline | |
| till 15 August 2021 | Early registration deadline | |
| from 16 August to 14 October 2021 | Late registration | |
| 31 August 2021 | Notification of acceptance/rejection of a lecture or e-poster | |
| from 15 October 2021 | On-site registration | |
| 22–24 October 2021 | ORL 2021 |
