Together they celebrated remarkable stories of transformed lives and looked forward to some exciting future projects.
Bute Mills, their new home is a five storey building containing bespoke training areas and facilities, office and meeting spaces and a drop in centre.
Youthscape works locally in Luton but also across the whole of the UK, supporting and equipping youth workers and working directly with thousands of vulnerable young people.
The service included contributions from numerous individuals who had been impacted by Youthscape.
Spoken word was shared from Koko (Girl's Brigade)'s Meg Canon who charted the struggles of being a 15-year-old girl.
The Archbishop of Canterbury commended Youthscape for being simultaneously Christ-centred while still accepting everyone.
He also applauded the fact that people's stories were real and not tidy.
When asked how the church could engage better with youth, Justin Welby warned of treating people as categories.
He argued that there was no such thing as 'young people,' just individuals who were uniquely special.
The Archbishop spoke about Advent, stressing that Christ offers a greater future than anyone could imagine.
He spoke of the importance of hope, and promoted Bute Mills as a commitment of hope.
After his first visit to Youthscape, Justin Welby said that he wanted to return because he had caught something of the smell of hope.
He encouraged everyone at the event to become a people of hope; embodying those whose lives give hope to people who need it.
18 year old Ellis Jones, whose own life has been transformed by Youthscape, spoke of her vision to see Bute Mills as a place where scared people, like her can be noticed and feel safe.
Alex Drew, Director of Youthscape's local work in Luton admitted that there are not many places that young people are proud of in Luton.
Her dream is to see Bute Mills become a place where young people can find a home from home and a safe place to ask questions.
By Ruth Jackson