Wellington FC was a monthly affair in 2000 and not the weeks I was in Paraparamumu. There are things going-on in the Hutt valley and Johnsonville (ish). Irish pubs in Wellington are worth an ask (normal speech in Kiwish). Levin is monthly and was still going in 2000, in 1995 it was buzzin and very inclusive.   Hamilton has (had) a monthly affair but it seemed to be in a private house. There were monthly things in Hawkes Bay, I did find a site that listed a lot of things, it was a link/subpage of a site with a name like musicNZ or NZmusic.
I could give you contact names but as they don't answer e-mails I am not sure if they are ignoring them or no longer there.