Simplify the following text for a Grade 10 native English-speaking person.
Original: The official part of the celebration starts on the 29th , with the opening of the Faroese Parliament , in the day there is a procession , with many people , from the churches in the islands .
Simplified: The official celebration starts on the 29th , with the opening of the Faroese Parliament , a custom which dates back some 900 years .