More than 120 event planners are attending the one-day event, which will focus on "Who is doing what, how and why?", covering the sustainability practices adopted by event planners in their live events.
C&IT news editor Alison Ledger will be chairing a debate on 'Why sustainability makes business sense' with Nestle's head of sustainability Inder Poonaji, Coffee Republic's founder Sahar Hashemi and Cori Drogemuller, external communications manager of Cisco.
Hewlett-Packard head of events Jane Culcheth-Beard and Innocent head of creative Dan Germain will also be speaking at the event.
Last year's event won a Gold award at the 2013 C&IT Excellence Awards.
The Sustainable Events Summit was created through a partnership between agencies Smyle and Positive Impact, with support from a variety of other businesses and industry bodies.