short/extensive training on computational chemistry
Did you check the offerings of the national chemical societies and their special interest groups?

In Germany, that would be the CIC - Chemie Information Computer group of the GDCh - Gesellschaft Deutscher Chemiker.

Cosmologic provides TURBOMOLE workshops.

In 2014, the Max Planck Institute for Chemical Energy Conversion organized a Summer School during which a course on QM/MM with Frank Neese's ORCA was given. I don't know if they plan something similar this year.

The NSCCS has some upcoming events.