If you're going to attend Entremuralhas 2015, you might find this calendar of concerts and related activities useful:
HTML: https://www.google.com/calendar/embed?src=pvdvrl1kecau5e7ucjhd9hhk6o%40group.calendar.google.com&ctz=Europe/Lisbon
ICAL: https://www.google.com/calendar/ical/pvdvrl1kecau5e7ucjhd9hhk6o%40group.calendar.google.com/public/basic.ics
XML: https://www.google.com/calendar/feeds/pvdvrl1kecau5e7ucjhd9hhk6o%40group.calendar.google.com/public/basic