The Festival was started in 1987 to commemorate the Golden Jubilee of the College.
Schools invited to take part come from both the state and independent sectors.
The Festival has a record of featuring future England players, including former captain Chris Robshaw, British and Irish Lion Mako Vunipola, Charlie Sharples, Mike Tindall, Jonathan Joseph, Zach Mercer and most recently Marcus Smith, who won player of the tournament for Brighton College in 2016.
16 British teams, including hosts St Joseph's, compete in a 2 day competition.
Past De La Salle winners include John Fisher School, Millfield, Brighton College and St Joseph's College.