The Vendry by Groupize.ai | 8,394 followers on LinkedIn. The Vendry by Groupize is a marketplace and professional community for corporate event planners. Join us today! | The Vendry by Groupize is a digital marketplace and professional community for the events industry. By joining The Vendry by Groupize, event professionals will gain access to powerful tools that streamline venue and vendor sourcing, keep them informed on industry trends, and provide fresh inspiration for their events.