They are vying with leaders from big agencies including Jack Morton Worldwide, Grass Roots, Zibrant and World Events for a top spot in C&IT's annual influence index.
Tomorrow is the last day for nominations, so don't miss out on your chance to tell us who you think made a significant impact on the UK events industry in 2009.
The shortlist will be published on citmagazine.com/power50 on Friday 27 November and the final 50 will be revealed at an interactive launch event on 15 December at Dukes in London. To register your interest in attending the event, please email email@example.com
Want to find out who made the grade last year? See the Power 50 2008 rankings