WWE Backlash was scheduled for June 16 but the show has been pulled off the schedule.
Dave Meltzer reports that the show was canceled and the presumption is because they moved the Saudi Arabia show to June 7 and they don’t want two pay-per-view events so close to each other.
WWE still has live events scheduled for the weekend of the Saudi Arabia show. I would assume those shows will be rescheduled for another date but that has not been confirmed by WWE.
As of this writing, WWE has live events scheduled for 6/7 in Salt Lake City, 6/8 in Denver and Boise and 6/9 in Oakland and Fresno. There is a Takeover show scheduled for 6/8.
The Takeover show was always meant to be a standalone event but it may be a challenge to get the production crew back immediately after the Saudi Arabia show.