I don't know what this means 'now-traditional'
Reading a book, I came across the word 'now-traditional' but when I looked it up in the dictionary nothing was there.
this is the sentence: The gigs also included the now-traditional acoustic set by James Dean Bradfield.
Please help me.

Question

I don't know what this means 'now-traditional'
Reading a book, I came across the word 'now-traditional' but when I looked it up in the dictionary nothing was there.  
this is the sentence: The gigs also included the now-traditional acoustic set by James Dean Bradfield.
Please help me.

Answer

It means that now it is traditional. A short while ago the acoustic set was something new, but now everyone has one.

Answer

It is a "play on words."  Non-traditional is a familiar term that means not traditional or not customarily done or used.  We use this term often.
I suspect now-traditional is meant to indicate something that many still consider non-traditional,  which the person making the statement wishes you to believe has now become ordinary is is therefore currently, or "now", traditional.

لا تفوّت فرصة تعلّم لغة جديدة وأنت مرتاح في منزلك. تصفّح مجموعتنا المختارة من مدرّسي اللغات ذوي الخبرة وسجّل في درسك الأول الآن!