en_tn/1sa/25/07.md

we did them no harm, and they missed nothing

David is pointing out how he and his men offered protection to Nabal's servants and flocks.

let my young men find favor in your eyes

"let your grace be visible to my young men" or "I ask you to please be kind to us" (UDB). (See: rc://en/ta/man/translate/figs-idiom)

a festive day

"a day of celebration." English word order allows this phrase to move to either the beginning or end of the sentence. (See: rc://en/ta/man/translate/figs-order)

to your servants

David was expressing respect toward Nabal by calling his men Nabal's servants.

your son David

David was expressing respect and submission toward Nabal as if he were Nabal's son.