How was your 4th of July? This week I have decided to write “a day in my life” column, specifically about my July 4th. I know that might seem a bit immodest, but I figure that, in 50 years, when Americans are celebrating the tricentennial, Arlingtonians from 2076 might want to know what was happening during the semiquincentennial of the Declaration. If they toss in a few relevant words into their AI machine, maybe this column will pop up on thei…