One man may be a party to a contract or agreement. Several men may form a party. When no contract is implied, one man or woman must be spoken of as a person, not as a party.
Patron, Customer
Unless there is a sense of obligation or condescension, use the term customer and not patron. In like manner, use custom instead of patronage.
Per
Per is a Latin preposition and should be used only with Latin nouns. We should say per annum, but not per year; per diem, and not per day; per capita, and not per head. “He received a thousand dollars a year is shorter and better than “he received a thousand dollars per year.”
Perchance, Peradventure
These are poetic and archaic forms that should be avoided in ordinary prose.
Performers
“The entertainment consisted of reading, recitations, and singing, and the performers acquitted themselves well.” Readers, reciters, and singers are not performers. The term is applied to the stage, and to those who play on musical instruments. Even in the latter application, “he plays well on the piano,” is better than “he performs well on the piano.”
Period, Point