This weekend Mardi Gras hits Long Beach! Starting with First Fridays and going at least through Saturday with the official Long Beach Mardi Gras Parade and Celebration.   First Bixby Knolls will turn Artlantic Blvd into into a celebration of Beads, Art, and Music for this months First Friday. From their March newsletter:   "Enjoy music, food, mask making, and plenty of beads to keep things festiv…