“Composers of any era can be immortalized through their scores, but posterity is not as kind to performers who lived before the advent of recordings. The Hungarian violinist Joseph Joachim was arguably the most important fiddle player of the 19th century, and Aug. 15 will mark the 100th anniversary of his death. But don’t worry if you’ve made other plans and can’t attend the centenary tributes. There are virtually none, at least not in this country. Almost no one seems to have remembered.”