Ideally the review meeting should be kept informal and all members of the Scrum team should attend along with stake-owners, management, customers the Product owner and something I like to do is invite members of other scrum teams/development teams along to observe (This can also be a good thing to do in the retrospective from time to time and helps to share practices and promote good ideas within an organisation)
if you're doing Scrum there is in my opinion 10 must do's!
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