correct. The only mistake here is the word "grammaratically"!
Maybe a bit too much capitalization, but I'm not sure that qualifies as grammar.
Is this sentence grammaratically correct?
"Although I already wished you one at Seminary this morning, I still hope you have a Happy Birthday."
3 answers
Should "a Happy Birthday" not be capitalized?
Happy birthday should not be capitalized. I wouldn't capitalize seminary either.