I am not related to the organization of this competition, however there doesn't seem to be any blog post regarding it (and there's not much time left), which is unfortunate so that's why I'm writing this :).
Today (in approximately 4.5 hours, 14:00 UTC) starts this year's COI — Croatian Olympiad in Informatics. The contest is open and the registration page is here (while this page contains a redirect to the registration, along with their past problemsets).
The competition should be close to IOI style; It seems to contain ~4 problems and from what I understood, has a duration of 5 hours. A big difference is that there is no full feedback during the contest: every submission is only tested on the samples provided during the contest (I would expect them to change this format for COI but it doesn't seem to be the case).
Good luck! Let's discuss the problems and the solutions here after the contest ends :).