The weekend covers a range of events including an aquathon (5.5km run and 800m swim), a kids triathlon, an open water swim (750m and 2km options), sprint triathlon, and 5.5km fun run/walk.
Event Director Nicola Muggeridge said: "The awesome thing about our event is there is something for everyone. Whether you are an elite triathlete or someone who just wants to give triathlon or multisport a go, there are options to suit everyone," she said.
"We are extremely lucky to be able to host this event for its 30th running at the spectacular location of the Blue Lake.
"This year we expect to see an increased field of competitors, in particular for our kids triathlon. It's great to see each year this relatively new addition to the event keeps growing and means triathlon is approachable for all ."