They have a floorshow on the island resorts once a week, and you must not miss them. The staff of the resort with sometimes others coming from the villages present to the guests beautiful and most important than all authentic songs (hiva) and dances.
In Neiafu (the main town in Vava'u) you will not find nightlife. It's a very quiet, sleepy town. You will have a hard time just finding restaurants that are open for dinner, especially on Sundays.
There is nightlife, but when you're there when the yachties and tourists aren't, like November thru May, there's not much going on in Vava'u. Tonga Bob's Cantina has great (and the only) Mexican food, the cheapest beer and best liquor selection and shows sporting events on 2 televisions. I've had several 4am evenings there, and there's even a live band on fridays. The old crotchety folks go to Mermaid, young folks go to Tonga Bob's. There's also one nightclub that's open until 4am and 2 others opening that are packed year-round with locals and expatriates.
Theme: Eating and Drinking
Directions: Near the ANZ bank in Neiafu and above Coconet internet cafe.
Each Thursday night there is a fabulous night of entertainment with a smorgasbord of traditional dishes, dancing, music and song and a kava ceremony . My husband was picked to partake in the drinking of the Kava and for that he got a certificate and we got to go first to the buffet! I would highly recommend doing this . There are several around the island and its a good way to hear local music and see the dance. You can't go wrong . The ticket is $25.00 each.