The campaign asked artists including Grayson Perry and Cornelia Parker to turn ashes from the school into works of art.
Channel 4 has been shortlisted four times in the Entertainment category at this year's Cannes for its Paralympics campaign, "We're the superhumans".
The campaign was recognised under sports: film, series & audio; excellence in sponsorship or partnerships in sports entertainment; excellence in audience engagement or distribution strategy for sports entertainment; and TV & VoD: fiction under 15 minutes.
In December, "We're the superhumans" was named as Campaign’s best campaign of 2016.
A further nine companies are represented among the UK’s 21 entries. Black Sheep Studios, Burberry and Weber Shandwick have two each, while AKQA, Abbott Mead Vickers BBDO, McCann London, PHD, Smuggler and Y&R have one apiece.
US entries dominate the shortlist, with 68 of the 191 total. 39 entrants are represented, with Pereira & O’Dell New York performing the best, with five, followed by VML New York, with 4.
The Entertainment Lions awards is part of Cannes Lions Entertainment, the strand of the festival for the entertainment industry.