Calendar
2026 - 2027 Events
| APRIL 2026 | |
| Wednesday, April 1 | New School Year Starts for Teachers |
| Thursday, April 2 | New School Year Starts for Students |
| Wednesday, April 29 | School Closed/Showa Day |
| MAY 2026 | |
| May 4-6 | School Closed/Golden Week Holidays |
| Saturday, May 16 | YK Sports Day Grades 1-10 |
| Saturday, May 23 | College Fair |
| Saturday, May 30 | Youth Parliament at IISJ |
| JUNE 2026 | |
| Saturday, June 13 | Tokyo Sports Day Grades 5-12 |
| June 19-26 | 1st Term Exams Grades 1-12 |
| JULY 2026 | |
| Saturday, July 4 | PTM Grades 1-12; By Invite Only |
| Friday, July 10 | Students Dismissed 2 Hours Early |
| Monday, July 13 | Summer Vacation Starts |
| AUGUST 2026 | |
| Monday, August 24 | School Resumes |
| SEPTEMBER 2026 | |
| September 21-23 | School Closed/Silver Week Holidays |
| Saturday, September 26 | Tokyo Sports Day Grades 1-4 |
| OCTOBER 2026 | |
| Monday, October 12 | School Closed/Nat'l Sports Day |
| October 19-30 | 2nd Term Exams Grades 1-12; Grades 1 and 2 start 10/21 |
| Thursday, October 22 | Tokyo KG PTM |
| Tuesday, October 27 | Yokohama KG PTM |
| Thursday, October 29 | Sports Day KG Tokyo and Yokohama |
| NOVEMBER 2026 | |
| Tuesday, November 3 | School Closed/Culture Day |
| Saturday, November 7 | Tokyo PTM |
| Sunday, November 8 | Yokohama PTM |
| November 14-15 | Tokyo PTM |
| November 14-15 | Tokyo Science Fair |
| Saturday, November 21 | Yokohama Science Fair Grades 6-9 |
| Monday, November 23 | School Closed/Labor Thanksgiving Day |
| November 27-29 | Model UN at IISJ |
| DECEMBER 2026 | |
| Saturday, December 12 | Yokohama Winter Concert |
| December 12-13 | Tokyo Winter Concert |
| Friday, December 18 | Students Dismissed 2 Hours Early |
| Monday, December 21 | Winter Vacation Starts |
