It's been over 10 years since I've done this! 
So, I have to send out STDs. Because of a musical festival planned the same weekend of our wedding, we have to move the date to a Tuesday. We already checked with our VIPs, and thankfully that works for everyone. Is it too early to send out STDs for August of next year? 
Also, can I address the STDs to just my friends' names, or do I include their SOs on the envelope as well?