If you think there's too much workload on employees, then I suggest you consider lighter topics. For example, focus on Communicating and Asking for Help. Discuss how to ask for help without hesitation and how everyone can contribute to creating an environment where everyone is accessible to each other.
Another topic could be Informal Brainstorming Sessions. Explore how, once in a while, you can have an informal brainstorming session to discover new ways of working or to discuss how to collect information and use it effectively.
Hope that helps.