Stocks was previously global MICE sales manager for the Carlson Rezidor Hotel Group for six years and has 15 years' experience in the conference and incentive industry.
This follows the recent appointment of two account executives, Emily Harper and Mark Throup. First Event has doubled its staff in five years.
Stocks will join business development manager, Emma Stoker, to help grow the business.
Managing director Richard Murphy said: "With Wayne's experience and knowledge within the industry and charming charisma, I have no doubt he will be an invaluable asset to the team and without a doubt, one-to-watch.
"It's amazing to be experiencing such growth and be recognised as one of C&IT's Top 50 event management companies. We have had a fantastic year so far and with Wayne having just joined us, I am eagerly anticipating the coming year."
First Event specialises in international incentives and conferences for clients including Amazon, NMBS, Polypipe, Interfloor and Inchcape.