Answer:
There are many reasons to get dressed up including a night at the symphony, an evening at a wedding, and a visit to an art museum.
Explanation:
Parallel structure (also called parallelism) is the repetition of a chosen grammatical form within a sentence.
The given sentence uses only nouns after the participle including: a night, an evening, a visit. That's parallelism.
All the other sentences use noun(s) and gerund(s) going, which means the pattern is not identical, and, therefore, there is no parallelism in those sentences.