The Acer Predator Masters Season 2 are starting today at 2 pm CET in Krefeld, Germany. It is a very laid back tournament featuring a lot of 2nd tier CS GO teams including HellRaisers, E-Frag and mousesports, who are favoured to win this tournament. It might not be the cream of the crop playing but a lot of the matchups are of even teams, which should make for some exciting games.
for the Timetable consult: http://www.hltv.org/news/17074-apm-season-2-finals-viewers-guide
Currently running is also the CEVO Professional Season 9 Placement Tournament. The prize there is a spot for the professional season 9, therefore its a tournament with new lineups and unknown teams aswell as 2nd or 3rd class CS GO teams.
For the full info and brackets go here: http://cevo.com/news/345/cs-go-season-9-professional-placement-tournament-february-10th-15th-/
Lastly, and most importantly, the ESL Pro League Season 3 is already in full gear and will be running until the end of April with all the top teams participating in Europe and North America to secure the top 4 spots of each region to qualify for a big prize tournament in London. Already there have been some top caliber matchups, and there will be many more where you can see the finest CS GO. Timetable and matchups can be found here: http://pro.eslgaming.com/csgo/proleague/
For all of these, twitch will be the platform for streaming these live on their various channels. Look for TakeTV, Cevo or ESL_CSGO respectively.