I've been lurking on this thread for far too long, but I want to share a few things to put things in context and hopefully put some minds at ease.
The reason "there is no communication" is because there isn't anything substantive to communicate. When the admissions committee says that they use a "holistic" review process, they actually mean it. They look at every single file completely and multiple times during the application cycle. Acceptances these days go out periodically and the committee meets periodically. Some days there is 1 call, some days a few, some days none. They are literally filling the last 40-60 spots in the class one at a time, and conservatively. As such, it takes time, and no one can say what the timetable is for finding out your fate. The positive side to this is that the next application that gets reviewed could be yours, that you could get a call any day.
The waitlist will be finalized by the end of March, and the expectation is that there will be a lot of movement off of it. However, this movement can extend as far as July, so plan accordingly.
I know that the impression a lot of people have about CU admissions isn't entirely positive because of the wait+silence, but my own experiences clearly showed me how much they care about each individual applicant. There is a reason why the community at this school is arguably its greatest aspect: the process for admitting new members to it is extremely selective. Personally, I had lost all hope for even getting an interview until I got the email in February. Then I just waited, and one seemingly whimsical day I got the acceptance call.
Don't worry about registration for 2nd Look Day being over; you can email Vidal and he will get you registered.
To all those waiting: when the journey is over, I hope that you find what you want, what you wish for, and what you deserve.