We are serving a large group in another room today. It may take time to serve you meals when we have a large group. Is that OK with you?
別室で宴会のため料理提供に時間かかるがよいですか？
We are serving a large group in another room today. It may take time to serve you meals when we have a large group. Is that OK with you?
初めに結論として、隣で多くの客に料理を出す日であることを伝えます。
宴会は多くの客と言い換えた方が早いと思います。
ご活用下さい(^^)
日本 
