What is the meaning of 第ー部


In attempting to translate an advertising poster, I ran into some
difficulties. The poster reads:

第一部 ガールズバンドライブ

第二部 カウントダウンライブ

The katakana is easy enough: 'Girl Band Live / Countdown Live', but in
checking the kanji on jisho, I'm finding the meanings of 'ordinal' and 'club,
category, or magazine counter', none of which seems to mesh together. 'First
Club / Second Club' are my best guesses, but it doesn't quite seem to fit.
Does anyone have an accurate translation?




My best guess with the 部 counter for this would be part one, part two, etc.
According to jisho.org, 部 can also mean a "part; component; element" so in
this context it would make sense to be Part one: girl band live, Part two:
countdown live.

