Terms on ceremonies and events

Ceremony of the Utakai Hajime (Imperial New Year's Poetry Reading)
Ceremony held in January every year, where in the presence of the Emperor, poems chosen from those presented by the general public, poems written by senja (the selectors), poems written by meshiudo (person who select the poems), poems written by members of the Imperial Family, a poem written by Her Majesty the Empress, and a poem written by His Majesty the Emperor are introduced in this order.
Eishinka (submissions by the general public)
Poems presented by the general public for the Ceremony of the Utakai Hajime (Imperial New Year's Poetry Reading)
Their Majesties' Garden Parties
Feasts held in Akasaka Imperial Ground, twice a year, once in spring and once in fall, where Their Majesties the Emperor and Empress invite dignitaries including the Speaker of the House of Representatives, President of the House of Councilors, the Prime Minister and the Chief Justice of the Supreme Court who are the heads of the three branches of government (legislative, executive and judicial), prefectural governors, and individuals who have rendered distinguished service in various fields including industry, culture, the arts and social activities, and their spouses.
Outa (the poems of the Imperial Family)
Poems composed by members of the Imperial Family other than Her Majesty the Empress and the Empress Dowager
Odai (Themes by His Majesty)
Themes of poems determined by His Majesty the Emperor
Welcoming Ceremony
While there is one of the reception of State Visits by the Imperial Family, this means ceremonies to welcome State Guests.
Court Luncheon
Lunch held in court, where distinguished guests from home and abroad are invited
State Dinner
While there is one of the reception of State Visits by the Imperial Family, this means dinners held at the Imperial Palace.
Gyosei (the poems of His Majesty the Emperor)
Poems composed by His Majesty the Emperor. (In the Ceremony of the Utakai Hajime (Imperial New Year's Poetry Reading), they are called Oomiuta.)
Ceremony of Imperial Conferment of Decoration
Conferment Ceremonies where the First Order of Merit is conferred upon the recipient by His Majesty the Emperor
Ceremony of Conferment of Decoration
Conferment Ceremonies where the Prime Minister confers the order upon the recipient. The ceremonies are held at the Imperial Palace.
Goinken (audiences)
Their Majesties' meeting with distinguished guests from abroad other than heads of state or members of Royal Families from abroad.
Ceremony of the Kousho Hajime (Imperial New Year's Lectures)
Ceremony held every January where Their Majesties the Emperor and Empress listen to experts lecture in human, social and natural sciences
Koji (reader of all poems)
The person who reads all poems in a flat voice in the Ceremony of the Utakai Hajime (Imperial New Year's Poetry Reading)
Kosho (accompanying singer to the hassei for poems from the second poem)
After the Hassei recites the first part, this is the person reciting the rest of the poem in the Ceremony of the Utakai Hajime.
Goesyaku
Their Majesties' unofficial meetings with people
Gokaiken (audiences)
Their Majesties' meetings with heads of state or members of a royal family from abroad
Goshinko (meeting in which experts offer lectures on their subjects of specialty)
Experts offering lectures in their specialty to Their Majesties the Emperor and Empress and other members of the Imperial Family
Farewell Call
While there is one of the reception of State Visits by the Imperial Family, this means the ceremonies for farewell for guests of state.
Imperial Investiture
Ceremony where His Majesty the Emperor appoints the Prime Minister or the Chief Justice of the Supreme Court.
Ceremony of the Presentation of Credentials
Ceremony where a newly appointed foreign ambassador extraordinary and plenipotentiary presents a letter of credence to His Majesty the Emperor
Visit of the General Public to the Palace for the New Year Greeting
Ceremony where Their Majesties the Emperor and Empress, accompanied by other members of the Imperial Family, receive New Year Greetings from the general public at the Imperial Palace each year on 2 January
Their Majesties' New Year Reception
Ceremony where Their Majesties the Emperor and Empress receive New Year greetings from His Imperial Highness the Crown Prince and the rest of the Imperial Family; the Speaker and Vice Speaker of the House of Representatives and the President and Vice President of the House of Councilors; Diet members; the Prime Minister; Ministers of State; the Chief Justice and Justices of the Supreme Court; other government officials with Imperial attestation (Ninshokan); Administrative Vice Ministers of Ministries and Agencies and other leading figures of legislative, executive and judicial organs; prefectural governors and chairpersons of prefectural assemblies; and heads of diplomatic missions to Japan and their spouses. The ceremony is held at the Imperial Palace each year on 1 January.

Senka (poems chosen from submissions by the general public)
Poems that are chosen from the eishinka, ones submitted by the general public, which are introduced in the Ceremony of the Utakai Hajime (The composer of senka is called yosenja)
Senja (the selectors)
Person who chooses senka from eishinka
Visit of the General Public to the Palace for His Majesty's Birthday
Event held on His Majesty's birthday, where His Majesty, accompanied by Her Majesty, His Imperial Highness the Crown Prince and other members of the Imperial Family receive congratulations from the general public
The Emperor's Birthday Luncheon
Lunch celebration held on His Majesty's birthday, where the Speaker and Vice Speaker of the House of Representatives and the President and Vice President of the House of Councilors; Diet members; the Prime Minister; Ministers of State; the Chief Justice and Justices of the Supreme Court; other government officials with Imperial attestation (Ninshokan); Administrative Vice Ministers of Ministries and Agencies and other leading figures of legislative, executive and judicial branches; and prefectural governors and representatives from all fields and their spouses are invited.
His Majesty's Birthday Celebration
Collective term for events held on His Majesty's birthday on February 23 every year, where His Majesty receives congratulations. Events held on the day include Shukuga no Gi (Congratulatory Ceremony), Enkai no Gi (The Emperor's Birthday Lunch), Chakai no Gi (Reception), Ippan Sanga (Visit of the General Public to the Palace for His Majesty's Birthday), and other such events.
His Majesty's Birthday Celebration Ceremony
Ceremony held on Their Majesties birthday, where His Majesty receives congratulations from His Imperial Highness the Crown Prince and the rest of the Imperial Family; the Prime Minister; the Speaker of the House of Representatives and the President of the House of Councilors; the Chief Justice and Justices of the Supreme Court.
His Majesty's Birthday Tea
Celebration tea held on His Majesty's birthday, where heads of the diplomatic missions from other countries and their spouses are invited.
Dokuji (master of ceremonies)
Host of the Ceremony of the Utakai Hajime
Ceremony of Appointment of Official with Imperial Attestation
Ceremony of appointment of Ninshokan (officials whose appointment and dismissal requires Imperial acknowledgement)
Haietsu (audiences)
Person of merit or key figure's official meeting with Their Majesties the Emperor and Empress
Baicho
Being allowed to listen to the lectures (goshinko) with Their Majesties the Emperor and Empress and other Imperial Family members
Hassei (singer of poems from the first poem)
Person who recites the first part of the poems in the Ceremony of the Utakai Hajime
Conferment Ceremony for the Order of Cultural Merit
Conferment Ceremonies where the Orders of Cultural Merit are conferred upon the recipient by His Majesty the Emperor
Miuta (the poems of Her Majesty the Empress)
The poem that Her Majesty the Empress or the Empress Dowager has composed
Meshiudo (The people who select the poems)
The person who composes a poem by special order of His Majesty the Emperor (The poem meshiudo has composed is called meshiuta).