With summer right around the corner this month’s Under $100 round up is all about one of the busiest times of the year: summer wedding season. Dressing your best for all of the events on your calendar can easily get pricey, so we found some of the best budget-friendly options for any style of celebration. Our roundup includes options for more formal looks as well as dresses that work for casual or coastal events. Plus, many are versatile enough to add to your closet as a go-to summertime staples for other special occasions or a…