Thousands of people
The subject of the sentence "When are the parades this Summer" is parade.
Down the street the parade marches.
When the word parade is at the beginning of a sentence
Look who's leading the parade! Let's go to the parade. Last year's parade had a runaway stagecoach!
A simple predicate consists of only a verb or verb phrase. In this sentence the verb phrase is -- has started
The word stream is both a noun (stream, streams) and a verb (stream, streams, streaming, streamed).The noun stream functions as the subject of a sentence or a clause, and as the object of a verb or a preposition.The verb stream functions as the action of a subject.Examples:The stream felt cool and soothing to our tired feet. (noun, subject of the sentence)We watched the parade stream down the street to the bandstand in the park. (verb, action of the noun parade)
A gerund functions as a noun, as the subject of a sentence or a clause, and as the object of a verb or a preposition. Examples:Fishing is my dad's hobby. (subject of the sentence)I need the workout that swimming provides. (subject of the relative clause)We enjoyed the dancing in the parade. (direct object of the verb 'enjoyed')He'll need new shoes for running. (object of the preposition 'for')
Were is the verb in that sentence.
the crowd amassed for the parade
She twirled the baton as she marched in the parade.
A declarative sentence.
At the beginning of a sentence and when it forms part of the proper noun. Example: Macy's Thanksgiving Day Parade