Guests at the August 1 event will be encouraged to help cover training costs for more telephone crisis support service counsellors. It costs $3000 to train one counsellor.
Mr Kelly started volunteering at Lifeline in 2009, two years after his 20-year-old son committed suicide.
"I was thinking of something to do to give back," he said.
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READ NOW"We never used Lifeline but had some amazing people who supported us through the most awful of times, so we wanted to be able to give back."
Lifeline chief executive Fiona Kalaf said demand for Lifeline services such as the telephone and online chat services was increasing significantly as more people became aware of how they helped in an hour of need.
"We are encouraging people from the business community to attend the dinner and, not only help support our work and enjoy an evening of hope and inspiration, but also have a fantastic night out," Ms Kalaf said.
Mr Kelly, whose wife Susie Biggon also volunteers at Lifeline, said it was a "privilege" to be able to help people at the other end of the phone at a time of distress.
"To be able to listen as they tell their story and connect them to their strengths, it's an amazing privilege" he said.
"Our loss was a terrible part of our lives but what we have learned from it has made us go in a different direction and we get great rewards from that."
Email blackdiamond@lifelinewa.org.au.