STARTALK Summer Hindi Programs: The summer programs are for Hindi teachers and students, and are offered nationwide in the US. Scan for a place in your area. School to college level students can apply.
The Summer Language Institute, John Hopkins University, Washington DC: College students
The Summer Language Workshop (SWSEEL), Indiana University, Bloomington, Indiana
Harvard Summer School, Cambridge, Massachusetts
SASLI, University of Wisconsin, Madison, Wisconsin
Please Note: Since I do not actively update this list, please do your own research in addition. If the link takes you to a dead end, please search for the program name.
Teaching Hindi as a Language (THAAL) 