Two to Three Weeks Before the Party
As well as including the party date, time and location, don't forget to ask about any special dietary requirements that the guests may have. You should include any other important information with the invitation such as a map or directions to the party location and whether you would like the guests to come in fancy dress.
It will make your life easier if you ask the guests to RSVP by a certain date. You may get a better response from busy parents if you offer them some time saving opportunities here such as text message or e-mail!