In his new role, Hargreaves will oversee the delivery of events in the corporate, agency and association sectors, with a particular focus on continuing the Barbican's trend for bringing together commercial business and the arts.
"He continually looks for new routes to market, opportunities and sectors to exploit and our hosting of Wikimania in September this year – one of the Barbican's highest profile events in 2014 – is testament to his ambition and talent.
"This promotion is well deserved and I look forward to working more closely with him as he grows into this new role."
Hargreaves added: "The Barbican's focus on events that seamlessly blur the lines between the commercial and cultural worlds makes it a fascinating and exciting place to work. Knowing that instead of selling space, I am selling a concept and ensuring the success of client events is really rewarding."