(over the top gay man voice) Oh I can see it now 40K themed wedding followed by a reception of 40K games! Now the bride can dress up as a sister repentia
and the groom can dress as an Arco-flagellant trust me she will want you to wear the mask for the wedding night.
So hit the gym.
Morfangdakka will be going a Plaguebearer of Nurgle because he is older than dirt and smells bad
. Tawa wants to be a stormboy. Jace's sister can be a Daemonette of Slaanesh
and Morfangdakka and tawa will try to dance with her all night long.
Other Heresy members can come dressed as them please until they get out of hand and your lovely new bride sets all of them on fire while screaming burn the Heretics!
Oh a fun time for all will be had. I can see it now.