Trust me, you will enjoy the day.
From our experience, the meal will be be well worth the 12 Euros price for the tickets - you will definitely not go hungry!! Nor will you want anymore to drink.
Whether you stay for the chocolate and the dancing is up to you. If you do though, I can assure you of a warm welcome from our Spanish neighbours and an enjoyable evening.
PS You can always watch Strictly on catch up!