Hello there!
My worthless 2c:
Based on our experience with the Perl Weekly, people usually click on 1 maybe 2 articles. So I think it is quite unlikely
many people will be able to follow the Advent calendars.
I also think it is quite hard to read so many articles in such a short
period of time. Especially as several other Advent calendars
are competing to our attention.
In December 2013 it got 3500 visits, in December 2014 it got 4,400 visits.
Instead of and Advent calendar in December, I'd suggest to spread out the 24 articles and have one published every 2 weeks during 2016.
Though it does not need to wait till January. It could be started next week. Then we could include them in the Perl Weekly