Most of the competitors have arrived in Cardiff, getting to know the city and each other, having rehearsals and giving interviews for the TV and radio coverage.
On Thursday night, they were welcomed to Cardiff and the competition at a party at their hotel. It was their first chance to meet the army of support staff around the competition - from drivers to dressers, librarians to BBC production staff.
Find out the full performance schedule for the week.
To get a flavour of the week to come, don't miss the preview programme on BBC Two tomorrow, Saturday 6 June - though if you do miss it, you can catch up with BBC iPlayer. The extensive broadcast coverage details can be found on our programmes page.