To attend the conference, you must both (a) register on SSRN and (b) be a member of the Society for Empirical Legal Studies. The CELS registration deadline was on Oct. 26.
Register for the conference by accessing the CELS 2012 Conference page on SSRN. The conference registration fee is $100 ($30 for students), which covers all conference activities including continental breakfast and lunch on Friday and Saturday. There is a separate $75/person charge for the Friday dinner, which will feature a Keynote Address by Ian Ayres.
To join the Society for Empirical Legal Studies, please go to the membership page hosted by Wiley Blackwell.