Callendar, who would claim the leagues' pitching award later on in the evening hurled 3 2/3 innings of no-hit ball before 15-year old league MVP Jacob Graves came on in the fourth inning to finish the no-no.
Callendar finished the game with seven strikeouts and walked five, while Graves struck out two Nichirin batters and did not issue a base on balls in his brief stint on the mound.
After a scoreless first inning, the Elks pushed across a run in the top of the second as Bubba Houghton legged out an infield single, stole second base, and went to third on a passed ball.
Elks' standout backstop Chandler Harmon knocked his teammate in with a sacrifice fly to center field.
Callendar faced eight Nichirin batters over the next two innings before the Elks gave the big right-hander a five-run lead in the top of the fourth inning.
Once again, it was Houghton sparking the rally when he drilled a one out triple to left field before scoring on a passed ball with Harmon at the dish.
Harmon singled to center after Houghton scored and he proceeded to steal second.
Taylor Davis made it four-zip when he drove a single to left that was misplayed, allowing McKnight to come all the way home and Davis taking third base on the Nichirin error.
Davis scored two pitches later on a passed ball before the inning ended with the Elks holding a 5-0 lead.
Looney drew a one out walk in the bottom of the fourth and went to second when Callendar booted a grounder back to the mound.
A passed ball moved both runners up one base before Connor Mealer walked to load the bases.
Madison Peete followed with another walk for an RBI before Elks' skipper Steve Hobbs sent Graves to the mound.
Graves struck out the next batter before Harmon picked off the runner at third wandering to end the inning.
The Elks tacked on four more insurance runs in the top of the fifth on a two-run single by Kurt Taylor, an RBI base knock by Callendar, and an RBI fielder's choice from Jacob Griffis.
In the home half of the fifth, Graves set down Nichirin 1-2-3 to finish off the no-hitter and the perfect season for the Elks, who have now won twelve straight league titles.