Teams can run either 45km, 100km or 250km, or participants can do the challenge as an individual.
They are among seven other additions, who all played for the Irish under-20 squad in the 2020 Six Nations competition.
Due to the shortened season, no teams will be promoted or relegated next season.
DULHC were coming third in Leinster Division One when the season was cancelled this year.
Trinity isn't generally known for its GAA prowess, but in the early 1990s Trinity were sweeping up Division One titles.
In June 1988, two of the world's best tennis players faced off in a charity match in New Square – as some students watched from their windows.
Former Ireland manager Brian Kerr has a little-known – but longstanding – family connection with Trinity. Here, he tells the tale.
The sailor and Trinity student – responsible for winning Ireland a spot at the Olympics – on the decision that denied her a shot at qualification.
Diego Coyle Diez came to Trinity to find a dysfunctional DUCAC. A year later, the organisation was transformed.
The statement comes in the wake of worldwide protests after the shooting of George Floyd in the US.