Thank you Himang for the great question. I don’t have experience conducting design review meetings. But from experience in review meetings as a whole, I can say it is best to keep the number of invitees medium sized since when too many people are included sometimes the conversations can be unproductive. Usually teams consist of one representative from each function.
Also, the agenda should be lean and include on the most important topics such as Design Review agenda, purpose, and goal. I am a bit alarmed that a design review meeting could go on for weeks.