By Laura Hawbaker It&rsquo;s the end of May, and the invasion has already begun. Every summer, an influx of Irish flock to Chicago. Like migratory birds, 1400 to 1500 Irish students descend upon the city with J-1 visas in hand. The J-1 is a three-month work visa for students between college semesters. Usually 19-21 years [...]