Ok, here it is:
SELECT tblClients.FirstName, tblClients.LastName, tblNoCallDays.NoCallFrom, tblNoCallDays.NoCallTo, tblClients.NoCallDaysMulti.Value, IIf((Date()>=[NoCallFrom] And Date()<=[NoCallTo]) Or [NoCallDaysMulti].[Value]=Weekday(Date(),1),"No","Yes") AS CallToday
FROM tblClients LEFT...