For the last eight days there has been daily protests in Washington DC. Organized by a group called Democracy Spring and transferred yesterday to a group called Democracy Awakening, these protests have seen a rotating group of people voluntarily getting arrested on the steps of the US Capitol Building. By time today's event is over, approximately 1240 people will have been arrested.
You can follow the hashtags #DemocracySpring and #DemocracyAwakens on Twitter.
ETA: YouTube stream is offline, but there is a lot of video on the channel.
edit: Changed to reflect official number put out by US Capitol Police.