Hello Di
Did you mean 18 Oct? If so there will be 39 people. If not, can you let me know your booking reference as I can't see that date for Wonder of China.
As for dress code, you are welcome to wear whatever you feel comfortable in, especially during the day. Many of our customers like to pack a few smarter outfits for the evenings but it's really up to you.
Kind regards,
Olly, your editor