Portfolio review events are a wonderful opportunity to receive feedback and to market your work, and I strongly recommend photographers consider attending one when they feel they are ready. I attended the New England Portfolio Review two years back and it certainly was an educational and productive experience, and I definitely plan on attending another one this year.
The New York Times is staging a new portfolio review event April 13th-14th of this year with a deadline coming up fast – midnight this Wednesday, February 13th. Kudos to them for making their event FREE – both to apply and to attend. This of course means it will be very competitive, but it is certainly worth a shot!
In the Boston area are two upcoming review events, too – the New England Portfolio Reviews at the PRC in Boston (review June 7th-8th, application May 6th-22nd), and the Griffin Portfolio Review Day on May 9th (applications begin April 11th) down in Boston. [EDIT – turns out the Griffin one was a false alarm and was from 6 years ago] – so just the New England Portfolio Reviews are this year!]. Both of these events are first come, first served. Good luck!