Hi Ann,
Many thanks for your message.
Whilst there are a couple of "formal" nights - a nice opportunity to dress up - generally the dress code is casual for daytime and smart casual for evenings. For formal evenings, men are requested to wear a jacket and tie or dinner jacket and ladies may like to take a cocktail dress or evening dress.
If you have any other queries, do not hesitate to get in touch.
Warm regards,
Elaine, your editor