Quote:
Originally Posted by masaegu
Sorry to butt in but that is simply not true.
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To clarify (masaegu, please correct me if I'm wrong):
「わたしのたんじょうびパーティ 」 "My birthday party"
「わたしのたんじょうびに、パーティ」 "For my birthday, a party..."
「わたしのたんじょうびで、パーティ」 "As it is my birthday, a party..."
「わたしのたんじょうびのパーティ」 Very awkward emphasis, but should still be (technically) correct. (meaning "My birthday party".) I may be mistaken though.
Since the OP wants to say "my birthday party", putting in an extra particle would be unnecessary.
This should be the correct one:
「わたしのたんじょうびパーティ 」