Find out if the interview is open or closed file. For example, I know at SCCO, if you are invited for an interview then you have met their academic qualifications and that is no longer a factor in their decision. I think every school is different (because some invite everyone to interview, while others only invite those that meet their academic qualifications). If you see that it's closed file and your academic qualifications won't be a factor, then go interview right away. You can be sure that they are inviting you to evaluate you in the way you interact and what you have to say about the profession and won't be rejected because of your grades. However, if you aren't sure what a school might do, then I think it's okay to wait since it's a good talking point to show how your grades have improved (but grades rarely come up at interviews).
Keep in mind that people interviewing now will be accepted at several schools perhaps, and so those schools are saving them a spot but that student can only go to one school. So spots will continue to open!
I also think it's appropriate to ask the schools about how full their class is when making that decision (or at least you can ask if they have had to start waitlisting anyone they are thinking of admitting at this point), or to let them know you want to wait until after the semester to show improvement in your grades. Being open and honest with them is probably a little refreshing, since that helps them get to know you better. Plus in sharing that, they might say back that you have passed the academic qualifications and that's no longer a factor so there's no reason to wait.
Sorry about Pacific 🙁 I hope the others go better!