There are a few ways to add braille to your invitations.
$1.
Then you can put the braille directly on the invitation either by using a
$1 which will print clear labels that you can stick onto the invitation itself. Or you could use a
$1 to add braille directly on your invitation.
Space is going to be an issue assuming your invitation is the size of a normal card, so you may have to limit the amount of information. There are two levels of braille, contracted and uncontracted, or grade 1 and grade 2. Obviously grade 2 would save space, but the labler only has the most common grade 2 braille and may not contain all of the braille you need.
Another option would be to send a note in braille that is separate from the invitation itself, that way you won't be concerned about space.