Events for 2015 I (co)organize or I attend. A list of conferences from 2013 and 2014 I have attended can be found here
In Spring 2015, at Northeastern I will organize (at least) two lecture series aimed on graduate students. These lecture series will be preceded by seminars covering prerequisites.

In the week of February 23-27 there will be lectures by Raphael Rouquier (UCLA). Here is information about them.

In the week of March 16-20 there will be lectures by Andrei Okounkov (Columbia). Here is information about them.

In the week of May 11-15 there will be lectures by Dmitry Kaledin (Steklov Institute). Here is information about them.

I am speaking at Lie theory workshop at UC Riverside, Feb 14-15.
I am participating in the AMS Sectional meeting at Georgetown University, Washington DC, March 7-8.
I am giving a master class on quantized quiver varieties at QGM of Aarhus University on March 23-27. Jose Simental Rodriguez is my course assistant. Here is an optimistic preliminary plan.
I plan to attend the conference at HIM, March 27-31.
I plan to speak in a workshop on enveloping algebras and Geometric representation theory in Oberwolfach, May 10-16.
With Roma Bezrukavnikov, Pasha Etingof and Valerio Toledano Laredo we coorganize a conference at Northeastern on symplectic resolutions.
I plan to give lectures on Rational Cherednik algebras in a summer school at ECNU, Shanghai, June 28-July 1 organized by Bin Shu and Weiqiang Wang.
Right after that I plan to go to PCMI summer program on Geometry of moduli spaces and Representation theory, organized by Roma Bezrukavnikov, Sasha Braverman, and Zhiwei Yun.
In November I visit Steve Griffeth at Universidad de Talca and give a series of lectures on Rational Cherednik algebras and categorification.
On December 9-11, Joel Kamnitzer from University of Toronto will give a series of three lectures preceeded by two preparatory lectures on Dec 4 and Dec 8. See here for details.
In December I visit the math department of HSE and give a series of lectures on Kac-Moody categorification.