A Mimosa Bar is a designated area at events, such as weddings or brunches, where guests can create their own mimosas. Typically, it features a variety of juices, like orange, pineapple, and cranberry, alongside chilled sparkling wine or champagne. Guests can mix their preferred juice with the sparkling wine, often garnished with fresh fruits or herbs. This interactive setup allows for customization and adds a festive touch to gatherings, making it a popular choice for celebrations and social events.