The phrase "to keep the audience engaged" means to maintain the attention and interest of an audience throughout a presentation, performance or event. Full definition
In preparing a concise and understandable set of slides, you will keep your audience engaged with what you have to say from beginning to end. (social.hays.com)
But genre elements and a solid grounding in period source material will keep audiences engaged throughout the film's thrilling conclusion. (screenanarchy.com)
To achieve category - leading success, the game needs to be supported as a service by a team that understands how to scale the product and keep an audience engaged for years. (gamesauce.biz)