<human>: Can you summarize the given text in a few sentences?

I previously worked with a guy, D, and a girl, M. D and M were close friends, but I was only close with M. D is now getting married. M was invited, but I was not. M's husband doesn't want to go, so she asked me to be her "date". 

I feel that if D wanted me to be there he would have invited me, so I feel weird going. 

I also found out there will be over 300 people there. I don't know if that changes anything, but I feel as though they obviously weren't being picky with invites so it's pretty apparent I wasn't invited in the first place. 

I'm pretty sure D would not be offended or upset if I went...we just weren't close at all. Would you go?
<bot>: I was not invited to a coworker's wedding. Another coworker wants me to go as her "date", but I'm feeling out of place.