R3 applicant who got an invite here!
They're not being shady. They just have a ton of events for different groups, and some of the invitations come with an option to interview on the days of the events. It's for scheduling reasons, nothing else. So (my theory is) if Redheads of Business and Former Astronauts Association have a set day of events for interviewees on X date and Y date, respectively, they want to go through the redheads and former astronaut applicants soon enough that
IF they decide to invite them, it's not too late for them to schedule to attend those events. That's it. Tin foil hats away, please.
They will get to everyone. It may not be on the timeline you want, but if you didn't get a rejection notice, you're not rejected, and you have to just repeat that over and over until the waiting anxiety starts to believe it.
I know it's hard.