I know several churches that do them, and also neighborhood associations, and craft show vendors. I even know one lady who does one in her home, with all her different crafts and things. It’s a way to gather together hand-crafters and buyers at a time when people are looking for unique gifts.
For our church’s boutique, people donate everything that will be sold, with all sale proceeds going to charity. There are bath and body products, paper crafts, jewelry, gift basket sets, candles, ornaments, Christmas decorations, etc. Everything is usually displayed like a craft show, and often food and drinks are available.
Mine is part of our church’s annual Ladies’ Christmas luncheon, so we have a full catered lunch, singing of Christmas songs, and a speaker. It’s wonderful!