• Theory Group Seminars (Tuesdays: Room 503 Huxley, 1.30pm-2.30pm)
  Organiser: Tommi Markkanen and Antoine Bourget

• String Theory Seminars (Wednesdays: Room 503 Huxley, 2.00pm-3.00pm)
  Organisers: Chris Arvanitakis and Matthew Roberts

• Student Seminars (Thursdays: Room 503 Huxley, 5.00pm-6.00pm)
  Organisers: Chris Erickson

• Cosmology Seminars (Fridays: Room 503 Huxley, 1.00-2.00pm)
  Organisers: Pat Scott

There are also less formal discussion groups that meet regularly: 

• Relativity Lunch (Thursdays: Room 602 Huxley, 1.00pm)
  Organiser: Fay Dowker

• Theoretical Physics Book Club (Fridays: Room 503 Huxley, 4.00-6.00pm)
  Organiser: Santiago Cabrera Marquez

Seminars are normally announced on the seminar mailing list, which includes automatically all group members. External people can also subscribe to the list.