Play NYT Connections Puzzle #818 Sun, Jul 27

Find groups of four related words Need hints?

Solve NYT Connections puzzle #818 - Group 16 words into 4 categories: CHILD’S PLAY, EASY, NO SWEAT, PIECE OF CAKE, BLOCK PARTY, FESTIVAL, PICNIC, TAILGATE, ELEMENTARY, GRADE, GRAMMAR, PRIMARY, CON GAME, HALLOWEEN, HEARTS, MAGIC SHOW.