Channel Tres and Ellen Allien will headline The Longest Set of Summer

Our mega stream to mark the longest day of the year - June 21 - will be headlined by Channel Tres and Ellen Allien.

Running for a whole 16 hours and 38 minutes, The Longest Set Of Summer - in partnership with Zalando - brings together a host of artists from across Europe and the US, spreading positive vibes through house, techno, disco and more.

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After a handful of names were announced, we can now confirm house-meets-rap DJ and producer Channel Tres and techno icon Ellen Allien as headliners for the event, which comes as part of Zalando's Festival Of Optimism. Proceedings kick off at 6.30am CEST and run all the way up until 11pm CEST, so get ready for a full day of joyous energy and uplifting tunes.

This latest line-up announcement also includes a special appearance from 'Show Me Love' singer Robin S, Dutch DJ William Djoko, Bosconi Records founder Fabio Della Torre, French band Les Pirouettes, Tropical Animals Collective, Polish DJ Tycjana Aquasanta, Ibiza-based Cici, Spanish rapper Sofia Gabanna and a back-to-back set from Czech Republicans NobodyListen and Kewu.

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These names join the already announced ABSOLUTE., the London-based DJ and producer who recently appeared on the cover of Mixmag, He.She.They resident SYREETA and Tender Games and House Gospel Choir, the latter two who perform live.

The Festival Of Optimism has run throughout June as part of the Activists Of Optimism campaign, which aims to celebrate and spread joy across Europe through a range of physical and virtual events. Some of these took place in Copenhagen and Stockholm.

Tune in on June 21 from 6.30am CEST at Mixmag's YouTube and Facebook.