Answer:
If my aunt were not in Dismount Fort, I might have forgotten that small town <u>where I went to elementary school only for two years in the late 1960s</u>.
Explanation:
This sentence contains the adjective clause where I went to elementary school only for two years in the late 1960s.
An adjective clause is a dependent clause that modifies a noun. It functions as an adjective in a sentence. The adjective clause where I went to elementary school only for two years in the late 1960s modifies the noun "town".
An adjective clause is introduced by a relative pronoun, a relative adverb, or a zero relative.
Relative pronouns are <em>which, that, who, whom, whose</em>.
Relative adverbs are <em>where, when, why</em>.
The adjective clause where I went to elementary school only for two years in the late 1960s is introduced by the relative adverb where.