Chembur Gymkhana has good banquet halls and is a good place to have birthday party for kids. You would, however, need to be referred to by a member for using the banquet halls. It is in a ideal location and very reasonably priced. Catering is allowed only from the in house restaurant. All party arrangements are taken care by a in house event manager. They allow you to make your own arrangements for some activities. For details you can refer www.chemburgymkhana.com. I had my first son's first birthday party there. We were satisfied with the arrangements. Food from the in house restaurant was very tasty. Event manager provided whatever we asked for and was also reasonably priced. We were satisfied with the services.