He said, "Let's vibe in a university concert."

Direct Speech: He said, "Let's vibe in a university concert."
Indirect Speech: He wished that we might vibe in a university concert.

• vibe (verb) (noun)
English Meaning: to enjoy music/a distinctive feeling or quality capable of being sensed.
Bangla Meaning: আবহ।

• Narration এর ক্ষেত্রে,
→ Let যুক্ত imperative sentence কে direct speech থেকে indirect speech করার নিয়ম:

→ Reported speech "Let me/him/her" দিয়ে শুরু হলে indirect করার সময় "said/wished/desired" হবে।
→ এবং এর পরে that + sub + might/should + Verb এর (base form) বসবে।

More Example:
Direct Speech: He said, "Let me have some rest."
Indirect Speech: He wished that he might have some rest.

Source: merriam-webster.