How to address the lack of seminars in my department My CS department greatly lacks invited talks hosted by faculty members and/or seminars organised within/by the department. Except for the seminars done by graduate students as a requirement for their degree, during the last year there was no seminar organised by the department/faculty member. If curious, the department size is relatively small (around 20 faculty members) and some faculty members are well-known figures in their areas. As a PhD student I like seminars and wondered how to address this to the department.
It's hard to change the culture of a department as a student.  You should definitely tell your advisor, and the department chair, that you wish there were more lectures.  You might also talk to other students and encourage them to express their feelings if they feel the same.

Then you should take action.  Is there a student chapter of the ACM at your school?  If not, organize one.  Then organize monthly seminars by inviting faculty and students in your department and from nearby schools to present their work.  If you can get a little funding, invite one of the world leaders in your area to give a seminar at your school.  You might be able to get funding through the department or through the ACM (I know SIAM gives funding for such things).

It requires work, but it sounds like it will be worthwhile to you.  It is also a great excuse to meet important people in your field.