

2016 Hasselbacken Chess Open
April 30-May 8, 2016.
A 9-round Swiss celebrating the 150th birthday of the Stockholm Chess Society. It features 34 GMs and 17 players over 2600, top seeds Dmitry Andreikin, Alexei Shirov and Zoltan Almasi.
After 7 rounds four players lead with 6/7: Ilia Smirin (ISR), Dmitry Andreikin (RUS), Jorden van Foreest (NED), and Gujrathi Vidit Santosh (IND).
The highlight of the event so far is 15-year-old US GM Sam Sevian's exciting win over Alexei Shirov from round 5, in a game which had rook sacrifices on g7 and b2, as well as many king-hunt lines at the end. You can watch Sevian's post-mortem analysis here:
https://youtu.be/e_67xK6wH28?t=4h53m10s
Website
http://hasselbackenchessopen.se/?lang=en
Live commentary has included GMs Ulf Anderson, Nils Grandelius and Pia Cramling.
Russian Teams Championship
May 1-10, 2016
Is actually several events in one, with women's teams and a seniors teams events, but the main attraction is the Open Teams, which features all of the top 10 Russian players -- except Andreikin, who is playing in the Hasselbaken Open -- including Kramnik, Karjakin, Grischuk, Svidler, Jakovenko, Tomashevsky, Vitiugov, and many more.
There's no GM commentary, but games can be followed live with computer analysis on both the official site and on Chess24:
http://ruchess.ru/championship/detail/2016/komandnij_chemp_ros_2016/
https://chess24.com/en/watch/live-tournaments/russian-team-championship-2016#live
17th European Individual Championship
May 12-23, 2016. Gjakova, Kosovo.
Is normally be one of the toughest events of the year, and although it has "only" five 2700+ players, it has 62 players rated over 2600, including defending champion Evgeny Najer and runners-up David Navara, Mateusz Bartel, and Denis Khismatullin. Format: 11 round Swiss, 1-game/day, 1 rest day (May 18).
Homepage
http://eicc2016.com/