Philadelphia is a Mecca of sorts.
Tyler School of Art Campus (of Temple University) in Elkins Park
used to have a great study program when I lived in Philadelphia. I am
not sure if their classes are open to continuing ed/ non-matriculated
students, but it is worth further investigation.
I recommend University of the Arts classes. I started off taking
continuing ed/ night courses their years ago to qualify for a
Do not discount apprenticeship opportunities that may be found
through local art galleries or art organizations, if you are wanting
to learn the fundamentals. Although you may have to make a firmer
time commitment to your mentor and have less choice as to techniques
you may be exposed to, lessons learned like subtle/ invaluable bench
techniques and honing basic metal smithing disciplines develop over
time. If you are beyond the basics, then more advanced classes are
the way to go.
Hope this helps.