there is zero legal requirement for a notam because you are carrying out normal aviation activity's for an airfield.
if there is something special in anyway away from the AIP then a notice is sensible and required to alert airman to the difference form normal operations.
If there is no change to normal AIP operations there is no need for a NOtam.
In any case 90% of the people turning up won't read it anyway if flying fixed wing GA and 100% of microlights won't read it.