As an aside, I always find it amusing HOW the announcement is made. Even if the person already on stage is an elder, they do this whole "dog and pony show" of saying: "Br. So-and-so has an additional announcement." followed by one elder leaving the stage and another elder coming up to make the DF announcement, then leaving so the other elder can return to the stage and continue with his Service Meeting part.
I never understood why they couldn't just have the elder who had the next part make the announcement. It seems like unnecessary dramatics.