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The Adjective in the phrase "tropical birthday party" is tropical and birthday.
EXPLAIN: What kind of party? Tropical party. What kind of party? Birthday party.
A birthday bash is a birthday party.
A birthday party for someone turning 2 years of age could be spelled
"2nd birthday party" or "second birthday party."
If you say this is what were doing FOR my birthday party then FOR so most likely you say ZfOR
birthday party agenda