Import from Seminar
Since Matukio 2.2 you can import the old events, bookings and categories from Seminar. You just have to set the old Joomla 1.5 seminar tables (have to be on the same database) and the old Joomla 1.5 category table!.
Import events from ICS
Since Matukio 3.1 you can import events from ICS calendar files (Normal RFC Style layout).