Which of these quotes with a subordinating adverb is punctuated correctly?
even so when i was invited to attend an important author event on the east coast; a friend took me in hand.
even so when i was invited to attend an important author event on the east coast a friend took me in hand.
even so, when i was invited to attend an important author event on the east coast, a friend took me in hand.
even so, when i was invited to attend an important author event on the east coast. a friend took me in hand.”