Put it at the very start of a Sunday-themed edit, then follow it with Okay Let's Go to move into the main activity, and save Ara Ara for a reaction later when a character appears on screen.
About this sound
This is a very short Neco-Arc clip centred on the phrase 'Big Sunday!', running for about 1.2 seconds. The delivery is bright, frantic and deliberately over the top, giving it a chaotic, playful energy that lands as a joke rather than a straight announcement. It works best as a sudden burst of Sunday excitement.