@veraleeon just received an email with more details from the 'Cosmopolis' screening in Portugal on May 29th.
According to her:
The screening is going to happen on Grand Auditorium of the CCB, on the 29th May at 8PM and will count with the presence of (confirmed to date) David Cronenberg - director, Robert Pattinson - the main actor, Don DeLillo - author and Paul Giamatti - actor.
Tomorrow (May 10, starting at 3PM), they will start to sell the tickets for the screening.
Ticket price: 10 €
You can buy ticket every day from 11AM to 8PM.
You can buy the tickets HERE
ETA: A few more details via @veraleeon, @3cheers4tyranny and @CarinaRK:
@3cheers4tyranny & @CarinaRK went to buy the tickets for the screening today & they wore informed that there is going to be a Red Carpet & they'll make a brief presentation before the movie.