Generally the UFC have fight nights on every couple of weeks around the world, but they’re all scheduled off Vegas time. Normally, they’re on at about 1-4am GMT.
BT Sport 2 shows them for free, so if you can connect to that, then you can watch it live, otherwise it requires buying Fight Pass or downloading the event.
There are the Preliminary Fights, or the undercard, which has the rising hopefuls and those looking to get ahead in their career and make it to the main show.
Then there is the Main Card Event, which is the primary fight and 4-5 fights leading up to it.
All fights are 3 x 5-minute rounds, except for headliner and title fights, which are all 5 x 5-minute fights.
There are 8 weight classes for Men.
There are 3 weight classes for Women.
You can check all the current fighters and the leaderboards here: http://www.ufc.com/fighter/Weight_Class?id=