The NALC's interpretation of the notice requirement refers to Sundays, rather than weekends, so Saturdays are included in the three clear days calculation.
From LTN5 - "Three clear days before a council meeting, notice of its date, time and venue must be posted in a conspicuous place in the parish (paragraph 10(2)(a) of schedule 12 to the 1972 Act). "Clear days" does not include the day on which notice was issued and the day of the meeting. Additionally, s.243 of the 1972 Act provides that the following days do not count when computing the three days:
b) a day of the Christmas break;
c) a day of the Easter break;
d) Bank holidays; and
e) days appointed for public thanksgiving or mourning."