That's a great date! It's my birthday
I understand your reasoning - it makes sense that people would like to have a long weekend in case they have to travel to your wedding - then they wouldn't have to take off of work. Some people may have their memorial day traditions, that they may have to sacrifice or adjust for one year - so what?! You're getting married - if you're important to them, then they will come & shouldn't mind sacrificing a day at the pool or cabin or whatever to enjoy your big day with you. Maybe make sure that you send the save-the-dates extra early, just so people will have plenty of time to make arrangements or adjustments to their plans if they have to.
Also - I think it was really rude of your coworkers to respond in that way. It's your wedding day - how selfish is it that they would make you feel bad about "ruining" their plans. It's only Memorial day, it's not like it's Christmas or anything. If people throw a fit & decline, then don't sweat it - the important people will be there for you & anyone that doesn't come, just means less cost for you
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