I’ve probably attended 1/4 of the weddings I’ve been invited to. I don’t think anyone shunned me for it or anything — honestly, the kid who you sat next to in first grade isn’t going to be that devastated if you skip her wedding! Save the vacation time. Save the money. If you want to be super polite, send the couple a gift, anyway. That girl from first grade will think you’re the nicest person ever if you send a $15 gift card along with a nice note giving your well wishes, and you’ll have saved yourself at least several hundred dollars!