The Shetlander is Scotland's youngest ever competitor and the youngest competing in this Commonwealth Games.
As part of the event, the royals took part in a live web chat and spoke to young adults around the commonwealth.
Glasgow 2014, Chief Executive, David Grevemberg, said: "Young people throughout the Commonwealth are at the heart of the ambitions of the Games.
@givenality Given is a youth activist and in 2015 was one of the recipients of the Queen's Young Leaders Awards, recognising young people from across the Commonwealth who are changing their communities.
At the time of McCreary's election, his wife Kate was the youngest first lady in the Commonwealth's history.
But whereas young Master De Botton runs excitedly round the commonwealth, having extracted new activist tools from spiritual tradition, Holloway's memoir - however beautifully written and dramaturgically candid - is an inspiritus lenis, the last gasp of a religious life.
There were calls to rename a Uttoxeter leisure centre after the young swimmer this week, to celebrate his Commonwealth success.
He said: "We have been talking to the young people here and in the wider Commonwealth about what they want in 2022 - the time when they will be at their peak.
We are taking an Opening Ceremony and elevating it into something which will not just be experienced by people but will leave a lasting legacy for the young people of Scotland and across the Commonwealth".
