When should invitations go out?
Wedding invitations should be mailed about six to twelve weeks before the
wedding date. "Save the Date" cards should be sent to out of town guests in
plenty of time for them to make travel and hotel arrangements (usually 3 to 6
months in advance). The inclusion of hotel suggestions is a common courtesy.
Invitations for more informal occasions may be sent out two to four weeks ahead
of time.
What do I do when I am obligated to invite someone I don't like or don't want
there, or who would make someone else uncomfortable?
This is a sticky situation but the word "obligated" should provide your answer.
"Obligations" outdo "feelings" every time. You extend the invitation and trust that
everyone is an adult and behaves appropriately. Your seating arrangements
during the reception should ensure that those guests who are uncomfortable with
each other's presence are seated well away from each other.
What is the best way to include out of town guests by sending an invitation but
making sure they are aware they are not expected to attend, or that no gift is
necessary?
The first thing to remember is that a wedding invitation includes a gift obligation,
even if the guest does not, or can not, attend. When preparing your guest list, it
would help to talk with friends and family who live far away to find out if they
plan on traveling to the destination.
Instead of an invitation, a better idea would be to send a wedding announcement
to those friends or family members who will not be included on your guest list.
An announcement carries no obligation for the recipient to send a gift; therefore,
many families send them rather than invitations if it is anticipated that the
recipients will not be attending. Announcements should be sent no later than one
week after the wedding takes place.

How do I decide the invitation RSVP date for my wedding?
Generally, the RSVP date is no later than two weeks before your wedding date.
For more informal occasions, including showers, you can extend the date to one
week prior to the date of your function.