The communication from Alfred Mutua that Monday is not a holiday is so so wrong, legally. Moi Day is a public holiday (not a national holiday) under the Public Holidays Act. Until and unless that Act is repealed or the legal notice under which Moi Day was created is cancelled, the day remains a public holiday.
Relevant provisions:
New Constitution:
Article 9
(3) The national days are—
(a) Madaraka Day, to be observed on 1st June;
(b) Mashujaa Day, to be observed on 20th October; and
(c) Jamhuri Day, to be observed on 12th December.
(4) A national day shall be a public holiday.
(5) Parliament may enact legislation prescribing other public
holidays, and providing for observance of public holidays.
New Constitution: Sixth Schedule, Paragraph 7
7. (1) All law in force immediately before the effective date continues in force and shall be construed with the alterations, adaptations, qualifications and exceptions necessary to bring it into conformity with this Constitution.
Public Holidays Act:
Section 2
2. (1) The days specified in Part I of the Schedule shall in every year be kept as public holidays.
Part I of the Schedule:
SCHEDULE
PART I
New Year's Day .. .. ..1st January.
Good Friday .. .. ..
Easter Monday .. .. .. March or April.
Labour Day .. .. .. 1st May
Madaraka Day .. .. .. 1st June.
Idd-ul-Fitr .. .. .. Date depending upon the appearance of the moon.
Moi Day .. .. .. 10th October.
Kenyatta Day .. .. .. 20th October.
Independence Day .. .. .12th December.
Christmas Day .. .. .. 25th December.
Boxing day .. .. .. 26th December
Section 4 of the Public Holidays Act
4. Where, in any year, a day in Part I of the Schedule falls on a Sunday, then the first succeeding day, not being a public holiday, shall be a public holiday and the first mentioned day shall cease to be a public holiday.