PC Gamer magazine are holding an event this coming weekend (5-6th March) in London, with many attractions and demonstrations. One such is of Bannerlord; an hour long section on both the Saturday and Sunday, including a 40 minute live demonstration of the gameplay. Apparently there is going to be a livestream of Bannerlord on Sunday (starts at 4pm), available to watch on Youtube. According to the TaleWorlds community manager, known on the forum as Captain Lust, there will be a 20 minute slot for Bannerlord in this livestream, so not the full thing.
Just thought I'd let people here know about it (there will be lots of other games shown on livestreams too). Here is a link to the event itself (not too late to get tickets I think if you can get to London ): PCG Weekender
and a link to the livestream for Bannerlord: BL Livestream
(it's not started obviously but it seems to be a sort of reserved feature on Youtube)
EDIT: The live stream for Bannerlord is at 16:00 on Sunday.