Legally married before the wedding

(Sorry in advance for the length)

My fiance and I live in Virginia. We're getting married in Maine (where I'm from) on the 29th of this month. We are allowed to apply for a marriage license in Maine with no waiting period but we wont be there until the Thursday before with quite a bit left to do in the last 2 days before the wedding. My dad's cousin is directing the ceremony but he is from Georgia so we also didnt want to chance not filing the paperwork correctly and possibly not being legally wed. The state of Virginia requires if we apply for a license here we need to have a ceremony here. So just for logistics we decided we'll just do it here a week or so beforehand.

Now up until this point I had been under the impression this would just be a quick event with no guests and no significance. However whenever I mention it to friends or coworkers they immediately ask "so when will you celebrate your anniversary?". At first I didn't think anything of it, since we are having a real ceremony and reception at the end of this month. But now I'm realizing that legally our wedding date will be whatever day I chose to have this (in my mind meaningless) ceremony.

My biggest concern now that I've searched the wonderful internet is that I dont want to deceive our guests. I'm being completely open about getting legally married before "my wedding day" but from my research the 29th will now technically be a vow renewal. Do you think my guests will be upset knowing this isnt the first time I will be saying vows?

My other problem is my coworkers who are unable to make it to the wedding in Maine would now like to celebrate on the day we do the quick ceremony here. Mind you this ceremony is planned to take place at the chapel at my work (I work at a hospital). I was thinking I would just wear my scrubs and my fiance would stop by after work on his way home (he does construction so think dirty boots, neon t shirt, hard hat hair). I have no objections to celebrating with my work family but I really didnt want to make a big deal about this legal ceremony especially with so many friends/family planning to attend on the 29th. I do plan to tell my coworkers I would not like this ceremony photographed or publicized in any way.

As an afterthought, if this will be my legal wedding day should I be putting more thought into what day we actually do it on? I scheduled it on the calendar just like all the other wedding appointments and without regard to the actual date.

Thank you all in advance for any advice, I know this was a long one!