Thrawn ran from 15th-22nd June, and the best I was able to find in a limited-time search was that his "redacted" info was listed after the Phoenix flash events list. So I don't remember if they listed any events after that, let alone what the dates were. The Wayback archive was unhelpful for me and running really slow.
The thing that makes me hope it is not that early is that Luke is the login character. Starting on the 10th means we will get 2/3 of the login shards after the event is over. Makes it kind of pointless to have him this month instead of last.
