You are putting one department on risk of redundancy that department will have told the other departments by that afternoon. So, you need to be having a combined communication strategy. This means that someone (club manager, couple of committee members) are talking to the department that’s at risk.
In the meantime, all the other employees have received an email advising them that they are not at risk, but that the other department is being restructured. You can do this in person if you trust your messenger (committee members) to say the correct things.
You need to proactively let the rest of the staff know what is going on, otherwise, you’re going to have rumours going left, right and centre. And if you’re only doing F&B but haven’t told green keepers yet, the green keepers might be waiting for you to tell them that they’re at risk of redundancy, and it’s all going to go extremely badly very quickly.