On their website they list the following services:-

hotel amenities:
"¢ Information desk
"¢ Air-conditioning
"¢ Nursery
"¢ Doctor's room
"¢ Concierge service (suitcase-bag carrying service)
"¢ Giftshop
"¢ Television room
"¢ Mini Club (4-10 year olds)
"¢ Private beach
"¢ Animation activities
"¢ Car rental
"¢ Dry-cleaning and laundry
"¢ Pool hall
"¢ Basketball court
"¢ Volleyball court
"¢ Tennis court
"¢ Garden

But not sure if the above entertainments include mini disco. Here's their email address you could try emailing and asking if there's evening childrens entertainment such as mini disco:- salesefes@surmelihotels.com