To view seminar details (e.g. Zoom links): Click on the event of interest.
To view a specific department: Click on tab on the top far right of the calendar(triangle shape next to "Agenda") and select/deselect the appropriate calendars.
To add a seminar to your Google Calendar: Click on the event. At the bottom of the event, click 'copy to my calendar'. Add event. Profit (intellectually!).
If you'd like to add a seminar to the calendar, please send an email to the administrator: firstname.lastname@example.org.