The Cambridge Pocket Diary notes certain days as being feast days or as anniversaries of members of the Royal Family.

Major feast days are shown in small capitals, minor ones in italics and royal anniversaries in plain lettering. Certain of these days (with others) are the days designated collar days by the Sovereign; another group constitutes the red letter days of the legal calendar.

The lists below indicate which days are noted in The Cambridge Pocket Diary and, by the use of red lettering, which of these are scarlet days. Those which fall on a fixed day of the year are noted first followed, in approximately chronological order, by those (e.g. Easter Sunday) which don’t (but excluding those Sundays which are not scarlet days). Collar days and red letter days are noted in the two remaining columns. Those fixed collar days and red letter days that are not included in The Cambridge Pocket Diary are shown in grey.

October
9th	St Denys
17th	St Etheldreda
18th	St Luke	Collar Day	Red Letter Day
28th	St Simon and St Jude	Collar Day	Red Letter Day
November
1st	All Saints	Collar Day	Red Letter Day
2nd	All Souls
14th	Prince of Wales born, 1948		Red Letter Day
20th	St Edmund
22nd	St Cecilia
25th	St Catharine of Alexandria
30th	St Andrew	Collar Day	Red Letter Day
December
1st	St Eligius
6th	St Nicholas
16th	O Sapienta
21st	St Thomas	Collar Day	Red Letter Day
25th	Christmas Day	Collar Day
26th	St Stephen
27th	St John the Evangelist
28th	Innocents' Day
January
1st	Circumcision	Collar Day
6th	Epiphany	Collar Day
25th	Conversion of St Paul		Red Letter Day
February
2nd	Purification of the Blessed Virgin Mary Candlemas	Collar Day	Red Letter Day
4th	St Gilbert of Sempringham
6th	Queen’s Accession, 1952	Collar Day	Red Letter Day
10th	St Scholastica
11th	St Radegund
14th	St Valentine
19th	Duke of York born, 1960
24th	St Matthias	Collar Day	Red Letter Day
March
1st	St David	Collar Day	Red Letter Day
6th	St Tibb
10th	Earl of Wessex born, 1964
17th	St Patrick	Collar Day
18th	St Edward, King and Martyr
21st	St Benedict
25th	Annunciation of the Blessed Virgin Mary, or Lady Day	Collar Day	Red Letter Day
April
4th	St Ambrose
21st	Queen Elizabeth II born, 1926	Collar Day	Red Letter Day
23rd	St George	Collar Day
25th	St Mark	Collar Day	Red Letter Day
May
1st	St Philip and St James	Collar Day	Red Letter Day
6th	St John Evang. ante Portam Latinam
27th	The Venerable Bede
29th	Restoration of the Royal Family	Collar Day
June
2nd	Coronation of Queen Elizabeth II, 1953	Collar Day	Red Letter Day
10th	Duke of Edinburgh born, 1921		Red Letter Day
11th	St Barnabas		Red Letter Day
14th	Corpus Christi
17th	St Botolph
21st	Prince William of Wales born, 1982
24th	St John Baptist	Collar Day	Red Letter Day
29th	St Peter	Collar Day	Red Letter Day
July
15th	St Swithin
22nd	St Mary Magdalene
25th	St James	Collar Day	Red Letter Day
August
15th	Princess Royal born, 1950
24th	St Bartholomew	Collar Day
28th	St Augustine of Hippo
September
15th	Prince Henry of Wales born, 1984
21st	St Matthew	Collar Day
29th	St Michael and All Angels	Collar Day
Movable
	Commemoration of Benefactors
	Lord Mayor’s Day		Red Letter Day
	Shrove Tuesday
	Ash Wednesday		Red Letter Day
	Easter Sunday	Collar Day
	Monday in Easter Week	Collar Day
	Tuesday in Easter Week	Collar Day
	Ascension Day	Collar Day	Red Letter Day
	Whit Sunday	Collar Day
	Monday in Whitsun Week	Collar Day
	Tuesday in Whitsun Week	Collar Day
	Queen’s Official Birthday		Red Letter Day
	Trinity Sunday	Collar Day
	Congregations of the Regent House (General Admission)
	Congregations of the Regent House (General Admission)
	Congregations of the Regent House (General Admission)

Collar Days

Knights Grand Cross (in the generic sense) wear collars of orders of knighthood on “collar days” as listed above and on any other occasion when instructed. In addition, collars are worn when Her Majesty opens or prorogues Parliament, and by those taking part in the ceremony of the introduction of a peer in the House of Lords. They are not worn after sunset, nor when mounted on ceremonial parades such as Trooping the Colour unless instructed otherwise.

Manner Worn:
Collars are worn over the shoulder straps or epaulettes of uniform coats and also over aiguilettes and fasted by white satin bows 1½ inches wide, the collar hanging at equal distance back and front. When the collar (from which the badge is suspended) is worn, the riband with its badge should not be worn.

Multiple Collars:
Though a knight grand cross may possess more than one collar, only one should be worn at a time. The rule about not wearing the riband of an order with the collar of the same order applies equally to possessors of more than one collar. However, they may wear the riband of another order.

Red Letter Days

On red letter days, judges of the High Court (Queen’s Bench Division) wear, at sittings of the Court of Law, their scarlet robes.