Only 1 thing will go away, the opening instance to crown pavilion.
https://forum-en.gw2archive.eu/forum/livingworld/jubilee/Complete-the-Opening-Ceremony-before-the-20th/first#post2619152
As we have mentioned previously, most of the Queen’s Jubilee content will be available after the next release which goes live on August 20th.
The only piece of content that you won’t be able to complete after the August 20th is the Opening Ceremony story instance, which is presented the first time you enter the Crown Pavilion. Please note that this also includes the achievement for completing this instance.
All other Queen’s Jubilee achievements will continue to be available, including the daily achievements (which will rerun in a similar order).
