Stephen Farrand has crafted a list of summer immersion programs for classicists. If you have any to add to this list, please send me a note! Here we go:
http://classics.avemaria.edu/polis_greek_and_latin (near Naples, FL)
In Europe, there is:
http://www.lvpa.de/index.php (they haven’t posted place and dates for the summer seminar yet. In Poland, the Czech Republic, or Germany).
http://www.paideiainstitute.org/ (for high school students. In Italy and Greece)