There are a few of regional contest that have analysis.

Maybe you want to try CERC 2012.

Link

There are several regionals that provide solutions. Note, however, that there are different "levels" of solutions: some provide code, others have a discussion presentation (usually a pdf) and some have both. In the following list I'll mark regionals with code with a 'C' and with a discussion with a 'D':

• NWERC: 2013 [C+D], 2012 [C+D], 2011 [C+D], 2010 [C+D], 2009 [C+D], 2008 [C+D];
• CERC: 2013 [C+D], 2012 [C], 2011 [C+D], 2010 [C+D], 2009 [C+D], 2008 [C];
• NEERC: 2012 [C], 2011 [C+D], 2010 [C], 2009 [C], 2008 [C];
• SWERC: 2013 [C+D], 2012 [C+D], 2011 [C+D], 2010 [C+D], 2009 [C+D], 2008 [C+D];
• PacNW: 2013 [C], 2012 [C+D], 2011 [C];
• GreaterNY: 2013 [C], 2012 [C], 2011 [C], 2010 [C], 2009 [C], 2008 [C];

I know this is very Europe biased, but in my experience those are the most likely to have discussions and/or code in English. I've tried some Asian ones that were nicely prepared, but didn't have any type of solution nor test cases available. I've also tried Brazilian ones, but as was the case with the Asian ones, good quality but no solutions.

There are also some nice subregionals with good quality solutions:

• GCPC: 2013 [C+D], 2012 [C+D], 2011 [D], 2010 [D];
• NCPC: 2013 [C+D], 2012 [C+D], 2011 [C+D], 2010 [C+D], 2009 [C+D], 2008 [C+D];
• NEERC Northern: 2013 [C], 2012 [C], 2011 [C], 2010 [C], 2009 [C], 2008 [C];

Again, I know this is very Europe biased. My recommendation would be to go for the ones with discussion and code first because it is generally easier to understand the solutions. Also, as a personal note, my favorite regionals in terms of Problem Set+Solutions are CERC, NWERC and SWERC (by this order). This doesn't mean the others are worse, simply that I prefer these ones better.

Note that a lot of these contests are already prepared here in Codeforces in the Gym (for example: SWERC 2013, NWERC 2013, NEERC 2013, ...), so don't bother to actually prepare a contest for these. There are also tons of really good contests like the "Summer Petrozavodsk Camp, Andrew Stankevich Contest"s and the " Codeforces Trainings Season"s. Sometimes you can find solutions for these contests by searching around and/or reading comments on related Codeforces posts, but unfortunately you can only see other contestants code for problems you have solved unlike regular Codeforces rounds (I don't necessarily like this, but I can live with it).

As a final remark I'd like to point out that obviously this is not a thorough list and there are much more regionals and subregionals out there with solutions.