The main event(s) at Vegas (since it split to two parallel GPs, and then each of those split into multiple sub-events which merged for day two) officially had a

The main event(s) at Vegas (since it split to two parallel GPs, and then each of those split into multiple sub-events which merged for day two) officially had around 8,000 players prior to drops. So the weekend saw about 16,000 players in the various GPs themselves, though of course there were more people total when side events and spectators/traders/etc. are counted.