Should I attend Seminars/Conferences that give Certificates upon achieving some number of attendance?
There is some value in attending these Seminars/Conferences that you may want to consider:


It shows that you are "doing more" than the minimum requirements
You may end up adding or emphasizing important keywords in your CV
The Seminars/Conferences you mentioned are from University/Departments and clubs.  If the Seminars/Conferences have any "Name Brand" involvement, such as corporations or other institutions, you get the name of the institution on your CV.