It’s hard to find Korea’s meaningful days in stapms. So I want request. I understand it couldn’t accepted all. But if you consider it, I will so glad to your team.

1/1 New Year (신정)

3/1 Independence Movement Day (삼일절)

4/5 Tree-planting day/ Arbor Day (식목일)

4/19 April 19 Revoulution Anniversary (4.19혁명기념일)

5/1 Labor Day (근로자의 날)

5/5 Children’s Day (어린이 날)

5/8 Paren’t day (어버이날)

5/15 Teacher’s Day (스승의 날)

5/18 May 18 Democratic Movement Day (5.18민주화운동기념일)

6/6 Memorial Day (현충일)

6/21 Summer Solstice (하지)

6/25 The Korean War (6.25 한국전쟁)

7/16 the beginning of the hot days of summer (초복)

7/17 Constitution Day (제헌절)

7/26 the beginning of the middle section of the hottest days of summer (중복)

8/7 Initial day of autumn (입추)

8/15 National Liberation Day / the beginning of the final ten hot days of summer (광복절 / 말복)

10/1 Armed Forces Day (국군의 날)

10/3 National foundation day of Korea (개천절)

10/9 Hangul proclamation day (한글날)

10/25 Dokdo Day (독도의 날)

11/3 Student Independence Movement Day (학생독립운동 기념일)

11/7 the beginning of winter (입동)

11/11 Farmers' Day (농업인의 날 {no more pepero!})

12/22 One of the 24 seasonal divisions, said to have the longest night of a year; it falls on December 22nd; on this day, people cook patjuk, red-bean porridge, and sprinkle the porridge on doors or walls little by little to drive away evil spirits. (동지)

12/25 Christmas (성탄절)

1/1 Lunar New Year (설날)

1/4 Onset of spring (입춘)

1/15 The day of the first full moon of the lunar year (정월대보름)

5/5 Dano, the fifth day of the fifth month of the year according to the lunar calendar (단오)

7/7 July 7th in the lunar calendar, the seventh day of the seventh month of the lunar calendar (칠석)

8/15 Korean Thanksgiving Day (추석)

‣ Solar Calendar

2/28 Democratic Movement Day (민주운동기념일)

4/3 Memorial Day for the Victims (희생자추념일)

4/11 Date of establishment of provisional government (임시정부수립일)

4/16 National Satety Day (국민안전의 날)

4/20 Disabled People’s Day (장애인의 날)

4/21 Scirnce Day (과학의 날)

4/22 Information and Communication Day / Earth Day (정보통신의 날 / 지구의 날)

4/25 Law Day (법의 날)

4/28 General Lee’s Birthday (충무공탄신일)

5/11 Adoption Day (입양의 날)

5/15 Family Day (가정의 날)

5/19 Invenion Day (발명의 날)

5/20 World People’s Day (세계인의 날)

5/21 Married Couple’s Day (부부의 날)

5/31 Sea Day (바다의 날)

6/1 Military Management Day (의병의 날)

6/5 Environment Day (환경의 날)

6/9 Oral Health Day (구강보건의 날)

6/10 6.10 Democratic Uprising Anniversary (6.10 민주항쟁기념일)

6/28 Railway Day (철도의 날)

9/7 Social Welfare Day (사회복지의 날)

9/10 Marine Police Day / Suicide Prevention Day (해양경찰의 날 / 자살예방의 날)

10/2 Old Man's Day (노인의 날)

10/5 World Korean People's Day (세계 한인의 날)

10/8 Veterans Day (재항국인의 날)

10/10 Pregnant Women's Day (임산부의 날)

10/15 Physical Education Day / Culture Day (체육의 날 / 문화의 날)

10/21 Police Day (경찰의 날)

10/24 United Nations Day (국제연합일)

10/25 Financial Day (금융의 날)

10/28 Calibration Day (교정의 날)

10/29 Local Autonomy Day (지방자치의 날

11/9 Fire Fighting Day (소방의 날)

11/17 Day of patriotic martyrs (순국선열의 날)

11/19 Child Abuse Prevention Day (아동학대 예방의 날)

12/3 Consumer Day (소비자의 날)

12/5 Trade Day (무역의 날)

12/10 Universal Declaration of Human Rights (세계인권선언일)

12/27 Nuclear Power Day (원자력의 날)

↑ One of the part of Korea Government site link.