@Fuad Salon they are good in highliting and they have a women's section. You also can try @Zubaida Beauty Center professional center that can do whatever you want in a great way
It's really hard to find that in Amman, anyway i recommend you to check with @SOUK JARA since they have a booth for bands and artistic people, they may have a band or someone who plays cello
It depends on what type of events you wanna do! I'm not sure you can find a place that can occupied that huge number of people under one roof to be honest!
Your best bit to go to a hotel there will be a Chinese food section of there buffet, try @Le Royal Amman tent, the atmosphere is amazing and the food is so delicious