The dress sounds beautiful but I think you will be too hot. Long sleeves will be extra uncomfortable in August and in hot, crowded rooms during pref parties.
I respectfully disagree on knee length as suggested by titchou. Just dont get your dress too short so that sitting is awkward.
I would have to say that "halfway down the thigh" is NOT conservative at all - and would have to second the recommendation for something closer to knee length.
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