You can find information about workshop registration at http://naacl.org/naacl-hlt-2015/ and register from the link there. CMCL is a one-day workshop.
Travel & general information about conference venue
CMCL is collocated with the 2015 Conference of the North American Chapter of the Association for Computational Linguistics – Human Language Technologies (NAACL-HLT 2015), taking place May 31 to June 5 in Denver, Colorado, USA. General information about getting to Denver can be found here: http://naacl.org/naacl-hlt-2015/
Accommodation information can be found here: http://naacl.org/naacl-hlt-2015/