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Monday is MLK Day, so a holiday, so messes with the usual schedules.
As for Peter Rabbit, because Antibody felt like it. He tends to put the IPOs of what are expected to be big box office movies on Saturdays but there's no rule requiring that. Plus there are only so many tentpole releases, there may not be any announced recently that are suitable for an IPO yet.
Maybe he just has fond memories of Peter Rabbit. 
Why is CREED2 IPO being released on a Sunday? And... Jan 16, 09:19
Monday is MLK Day, so a holiday, so messes with the usual schedules. Jan 16, 13:21
It gives everyone a reason to visit the site on a quiet Sunday...Love those page hits {nm} Jan 16, 21:24
