The Kooks and Mr Hudson are both set to appear at a tribute gig for Ou Est Le Swimming Pool's Charles Haddon, who died recently.
The 22-year-old singer is believed to have taken his own life following the band's appearance at a festival in Belgium last month.
The event, dubbed Chazzstock, will take place at Koko in London on October 4.
It has been organised by friends and family to celebrate Haddon's life and achievements, and will also feature Kissy Sell Out and Daisy Dares You.
Other acts on the bill include Eddy Temple Morris, Man Like Me and Tribes.
Tickets, priced at £10 each, go on sale on Friday (September 10) at 9am. For more details, check out Gigwise Gig Tickets.
All ticket proceeds will go to MIND, which is the UK's leading charity for Mental Health support who work towards improving the quality of life of people who experience mental or emotional distress.
Meanwhile, Ou Est Le Swimming Pool's debut album 'The Golden Year' will still be released as planned on October 3.
MORE: Charles Haddon RIP: Ou Est Le Swimming Pool Video Tribute.
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