If you get resoonses...you will see answers all over the place. When you complete your application has no bearing on the Appointment date. Purely (educated ) speculation on my part, but if there is a rush of appointments in the next week, its likely very competitive candidates who Admissions identified as close, but not quite, LOA material, but wanted to wait until all applications and nominations were in before making the offer.
As always, don't try to read too much into any development---there are still many, many , applications that have not even been reviewed yet. Be patient.