Radical 石
13 strokes
stone 石 (115a) + stand side by side 並 (396b) = bump into 碰
This can mean “to encounter”, or to literally “bump into” something.

Imagine setting up large (Stonehenge-type) stones like a huge domino run — they stand side by side so that when each one falls it will bump into the next one. / The dwarf warns people to be punctual or they will miss this big event.