Latitude 2019 18-21st July "Special Closing Performance", whatever that means.
https://www.latitudefestival.com/line-up-2019
Edit: According to
https://underworldlive.com/events/ it's on the 20th - judging by the poster design I think that means that Snow Patrol and UW are essentially dual-headliners on the main stage
Edit edit: Also Primal Scream on the same weekend, brings back memories of YouFest Madrid, 2012!