Organizers say 17 people have signed up to take part . The chain is expected to stretch for about 250 miles ( 400 kilometers ) Convergence and Union party politicians are calling for a vote on self-determination by 2016 . But the Spanish government says that Catalonia already has sufficient home-rule powers .
Organizers say 370,000 people have signed up to take part . The chain is expected to stretch for 400 kilometers ( about 250 miles ) Catalan politicians are calling for a vote on self-determination by the end of 2014 . But the Spanish government says that Catalonia already has sufficient home-rule powers .