While the show has never officially confirmed the dates of events, Reddit user Herbrax212 spotted a timestamp in security footage of Maeve's grand escape which reads June 15, 2052. Based on that date and information from the below sources, I made an attempt at creating the timeline of events from the Season 3 Date Announcement video compared to the events in the first two seasons of Westworld. Events in grey are from the Season 3 Release Date trailer and events in white are from the first two seasons of Westworld.

So pumped for Season 3! Release date 3/15/2020

Westworld Timeline Source: https://www.insider.com/westworld-timeline-spoilers-2018-4

Westworld Timestamp Source: https://www.insider.com/when-is-westworld-taking-place-2016-12

Season 3 Release Date Trailer: https://www.youtube.com/watch?v=aeEn609nkRs