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Spot on comments.The level that the MDC operates at doesn't affect the match you're refereeing in any way, shape or form, so don't worry about it. Key point is exactly the same as for any time you're being watched by a MDC or observer - forget they're there, and don't referee any different to how you usually do. Afterwards they'll tell you what you're doing well, and what you could improve on. Trying to change your game to try and impress a MDC/observer will likely lead to making mistakes during the game and not refereeing as well, because you're too busy worrying about what you think they want from you, instead of focusing on what's actually happening in the game.