Invitation from William S. Mitchell (Librarian, Newcastle University) to Pybus inviting him to tea at the University library on the 15th of September 1965 to meet delegates attending a joint meeting of Nordisk Bibliotekchefsmöte and The Standing Conference of National and University Libraries.

Invitation for Pybus to the International Medical Congress, London, August 6th-12th, 1913. Including Daily Programme and Maps of London.

Invitation from the Committee of Management of the Sir G.B. Hunter Memorial Hospital requesting Pybus attends the Official Opening by Lady Grieg on 5th April, 1941.

Invitation from the Mayor of Oslo to the Laing Art Gallery on Saturday 21st October, during Norway Week 1961 to see the Edward Munch Exhibition. Pybus has written notes on this.

Invitation addressed to Pybus from the Matron and Members of the Nursing Staff (RVI) to attend the Presentation of Prizes and Certificates, 30th May, 1968.

Invitation from W Bro. Frederick Charles Pybus, W.M. to attend the duties of the Lodge on Friday 19th October, 1928 for the Annual Meeting and Installation of the W.M. Elect.

Invitation from W Bro. Lionel Langford Westrope, W.M. to attend the duties of the Lodge on Friday June 20th, 1919 for a regular meeting.

Invitation requesting Pybus attend the Laying of the Foundation Stone and Official Naming Ceremony of the Teesside High School for Girls, on Saturday 4th October, 1969.

Invitation pamphlet to the ‘Reunion Internationale’ commemorating the discovery of Radium, electrons, x rays etc… to be held in Paris, 23-30 November, 1938.

An invitation from University of Durham, King's College, Newcastle upon Tyne for the opening of the Medical School on Queen Victoria Road, opening by His Majesty King George VI.