K.P.
Not sure on the ENT eval, but I can clarify the developmental eval for you (was my job as a psychologist for many years).
Yes, it will be a room with a handful of specialists, including you b/c you are the "specialist" on your child! They are not necessarily doctors, but will all hold at least one advanced degree in their area of expertise. Your child will be engaged in different play activities (at least he'll think they are playing) and the social worker will be asking you a ton of questions about his early development- you may want to bring the baby book if you don't remember ages/dates! The specialists will observe your child playing, communicating and relating to them and to the objects (all specifically chosen) in the room.
Afterwards they will not "grade" him, but compare his demonstrated skills against the development of "typical" children. You will receive a report that highlights your child's 'percentile" ranking in the five major areas of development (Cognition, Language, Social-emotion, Fine Motor, Gross Motor). Percentiles are not the same as percentages. Percentiles reflect the "percent of children who would score below your child" on a specific skill. For example, if your child was at the 15% percentile for expreseive language, it means that 85% of his same-age peers are better able to engage in those skills.
Areas that are weak will be addressed through your county's Early Intervention program. The therapists will work with you in your home to further your child's skills. Good luck and feel free to PM me if you have any specific questions or when you get the report! They are long and very technical!
**Lots of my grad school cronies do the EI/ preschool evals for Henrico and Richmond City. Let me know if you need anything!