Once fall sets in, the musical offerings in and around Yale are varied, inexpensive (or free) and they are so frequent, no one can see all that is offered without back-up.
Have a look at Doug’s review of Arturo Sandoval’s concert at Sprague Hall, and Barbara’s review of The Oneppo Series performance of The Soldier’s Tale.
Don’t forget, many of Yale’s student concerts are streamed live, and that DOES come in handy when you are over-booked or just too tired to put your face on.