There aren't too many things here, you possibly want the main public department website.
Perhaps you want the
Department Seminar Calendar.
Note: If you need username/password to add/edit calendars without logging into the old department intranet, contact Jiri Lebl at lebl at okstate.edu
There is still the old, and totally out of date, Department Intranet that used to be at this address, you may want that if you are from the department and are looking for some old information. If you don't know what it is, you probably don't want to go there.