Sorry, but you get 1 day. No couple should be expected to put their wedding plans on hold due to yours. If your wedding is on a Saturday, they can get married on Friday or Sunday if they want and really they can choose Saturday too.
It's not uncommon in a group of friends or family for more than one person to be getting married near the same time. I had two cousins get married the same day and they are also cousins but neither would budge on their chosen date so it left the rest of us picking one or the other to attend. I was one of the few who attended portions of both weddings.
Also, you only get 1 wedding per marriage. A courthouse/JOP wedding is still a wedding and whether you get married there, a beach, backyard or a 200 year old church the legal requirements are the same and you're just as married each way. Having a fake do-over at a later date won't make you more married. You can't get married in December and have a wedding a few months later, weddings are for people who are not married.
Bachelorette parties & bridal showers like weddings are for people who are not married and they are hosted/planned by someone else, not the bride. You're not owed one a bachelorette party or a shower.
What your friends or family do is their business and who got engaged first, who was dating first it totally irrelevant.
Read up on wedding etiquette a bit before you make yourself look like a fool.