A jocund group.
A cheerful and happy birthday party is an example of something that would be described as jocund.
Origin of jocundMiddle English from Old French jocond from Late Latin jocundus (altered by associated, association with Classical Latin jocus, joke) from Classical Latin jucundus, pleasant from juvare, to help
Origin of jocundMiddle English from Old French jocond from Latin iūcundus, iōcundus from iuvāre to help, delight
(comparative more jocund, superlative most jocund)
From Old French jocond, from Latin iūcundus (“pleasant, agreeable”).