<P> Dionysus exits to go into the mountains , and the chorus enters . They dance and sing , celebrating Dionysus and adding details of his birth and the Dionysian rites . Then Tiresias , the blind and elderly seer , appears . He knocks on the palace doors and calls for Cadmus , the founder and former king of Thebes . The two venerable old men are planning to join the revelry in the mountains when Cadmus ' grandson Pentheus , the current king , enters . Disgusted to find the two old men in festival dress , he scolds them and orders his soldiers to arrest anyone engaging in Dionysian worship . He wants the `` foreigner '' , whom he does n't recognize as Dionysus in disguise , to be captured . Pentheus intends to have him stoned to death . </P>
what are tiresias and cadmus doing at beginning of the play
planning to join the revelry in the mountains