July kicks off with 4th of July festivities. Make sure you are in a good place to watch the fireworks (which usually start at 10:10 p.m.).
A fun event to attend is All Pints North. The number of micro-breweries in the area has increased year after year. Duluth wanted to be known as the Craft Brew Capitol of Minnesota and I think they have achieved it. The wonderful Lake Superior water has helped draw these businesses here.