Meeting his friends for the first time... Any tips?

I put another post last night, but it was probably a weird time to post and fell by the wayside...

Basically the guy I am seeing, exclusively but not officially, has asked me to go see his friend's band with him in a local pub (British bar). Been seeing him about a month cos I've been busy with essays, but met up twice and on those two times it was for 2 nights each - he stayed at mine 2 nights, then I stayed at his 2 nights.

So yeah, firstly, got any tips?

Secondly, how do I interpret him asking me along?
Meeting his friends for the first time... Any tips?
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