I am getting married in 5 months and sent out my "Save the Date" magnets last July. However, as the wedding is getting closer, I have realized I don't want to invite some of the people I sent Save the Date's to. A few friends have suddenly dropped off the face of the Earth and one has become a former friend due to issues. Do I have to send invitations to people that I sent Save the Date's to, but I have not spoken to in almost 6 months?