Celtica Celtica master jeweler Peter O'Loughlin displays and sells his silver and gold jewelry at many festivals and markets in California. During the Summer and Fall, Peter can usually be found at a craft show (see CRAFT FESTIVALS ).When he isn't at one of these fairs, he will be at local Markets: the Telegraph Avenue Street Artists Market in Berkeley on Thursday evening at the San Rafael Farmer's Market in San Rafael. You have a comment, a question, a special request. You want to know where you can find Peter. Contact us at Celtica