There is another BOWS in April or May I think. If you can wait till the next bows for the perks and if you like the hotel can book there. Or keep a look out if Novotel will be having a show?
You can try to bargain I Guess if there is not much perks?
I booked Novotel at their wedding show in 2014 for my wedding this year. In the end bows had better pricing. ;(
Mind sharing what is the additional perks nego?