Usage patterns
〈場所〉が賑やかだa place is lively/bustling
This shopping street is always bustling.
賑やかな声で〈動詞〉to do something with cheerful, noisy voices
The children are laughing with cheerful, noisy voices.
〈場所〉が賑やかになるa place becomes lively/bustling
The town becomes lively on festival days.
〈人〉と賑やかに過ごすto spend time cheerfully with someone
We spent a lively, cheerful time with friends.
賑やかな〈場所〉a bustling place
I walked through a bustling shopping street.