The Bible conferences in the Lake District, which have been operating for more than 100 years, are set to take around 15,000 people.
Organisers have already arranged overflow venues because the main tent isn't big enough to fit everyone in.
Keswick Ministries, which runs its annual convention, has also recently bought a site in Keswick close to its existing base to allow all of the convention to happen on one site.
They're also building a 400-person conference centre there to allow them to provide teaching and ministry across the year - something a majority of Keswick supporters have requested.
Speaking to Premier Jutta Devenish, from Keswick Ministries, said: "We have really worked very hard on our children's and youth programme, and also our 19-24s.
"The tents are overflowing... and we've also run out of handbooks, which is unheard of really.
"It's all good news, it's exciting, particularly because we're seeing more families and children coming through to the convention."
Listen to Premier's Aaron James speaking to Jutta Devenish:
