How to displayDATE for every MON, WED, FRI of each month for a full year

Here's for 2024. You may update the year as needed:

=LET(
    yr, 2024,
    start, DATE(yr, 1, 1),
    r, 1 + DAYS(DATE(yr, 12, 31), DATE(yr, 1, 1)),
    dates, SEQUENCE(r, , start),
    wday, WEEKDAY(dates, 2),
    FILTER(dates, (wday = 1) + (wday = 3) + (wday = 5), 0)
)