thank you question

I'm sure it's been asked a million times before but I'll ask again....

I'm writing my thank you cards out and there are a bunch of ppl who came to the wedding but didn't give a gift. I know they deserve a 'thank you for celebrating with us' card.... but, since we have a year to send out our thank yous and they technically have a year to send a gift, do i hold off on sending them a thank you for a while (on the chance that they're still sending a gift?)?

W e just got a gift in the mail yesterday, so I don't know what to do about this...

thanks!!