A few things - Mayor Bloomberg will be at the Metropolitan Avenue parade - the mayor goes every year. For Racked.com readers, just take the Q54 from Williamsburg. Maybe Bloomberg will save you a seat since there's no way he's got the onions to take a private car.
Bonus tidbit, on the next day Councilmember Melinda Katz will be at the Glendale Memorial Day Parade. She will be singing the Star Spangled Banner. I'm not kidding. She's apparently a great singer. I know her dad was the conductor for the Queens Symphony Orchestra, but didn't know she was a musician. It's tempting to make fun, but that's a freaking hard song to sing. If she can pull it off, more power to her.