The details for events provided in the source spreadsheet are in this document. The dates of the events have been determined from the event hosts' website and, when available, the previous attendance numbers were sourced directly from the organizers. We have also provided the requested information for each event in the corresponding event rows in columns B-J.
Most of the events for 2021 have not been canceled but a substantial portion of them have had postponements or are hosted on different dates. Furthermore, some events are entirely virtual. Finally, due to the pandemic, it is uncertain if any of the events will expect more or fewer attendees, depending on the preferred method of hosting the event.