"Easter People enabled thousands of lives to be equipped," she said, adding that Rev Frost's "hallmark was his ability to build teams" and "entrust and believe in people".
Steve Wild, director of evangelism at Cliff College and a familiar face at Share Jesus events, choked back tears as he remembered his friend.
"Rob's always been such an encouragement to me," he said. "Always, always the love was flowing through. The love of Christ was overflowing in him and that's why he could share it out."
Bringing tears to the eyes of many in the audience, he added, "Rob Frost, I thank my God every time I think of you."
Rev Frost was also the visionary of Pentecost Festival, a massive run of events across central London that will take place over Pentecost weekend this year.
"Pentecost Festival was a vision Rob shared with Andy. He very much wanted to see it happen," said Ms Izzard. "It thrilled him to see the programme templates just a few days before he died."
Son Andy added, "Rob was passionate about helping people find their vocation and calling in life."
Andy Dipper, CEO of Release International, of which Rev Frost was President, as well as Jonathan Oloyede, Pastor of Glory House, David Heron, Chairman of Premier Radio, and actor Graham Cole from "The Bill", were among the many others who took to the stage throughout the celebration to share their memories of Rev Frost.
Later in the evening, the Superintendent Minister of Westminster Central Hall, the Rev Martin Turner, challenged the congregation to let their lives be inspired by Rev Frost by committing afresh to God.
"God longs to come back to the centre of your life," he told them. "Rob Frost surrendered all to Jesus and now sees Jesus face to face."
The evening culminated in the commissioning of Andy and Chris Frost and Share Jesus interns, with commissioning prayers from Roger Forster, Jenny Impey, Graham Horsley, Clive Jones, Katei Kirby, Pastor Oloyede and Bob Kitching.
