Yatri from Lokannatha Swami's Vraja Mandala Parikrama try to understand how Rama lila, one million years ago plus, can appear in Mathura in Dvapara yuga.
ASA answered:
Everything starts in Goloka, no? Even if it occurred in the "past" it is starting in the "present" in Goloka.
One Radha tells Krsna: Today we are going to play like Sita and Lord Rama. I will be Sita, and Sridama (Her big brother) will be Ravana. He will kidnap me an hide me and you will play Rama and all the boys will play the Monkeys and try to find "Sita"!
It is so much fun that they expand Themselves as Sita and Rama and play the lila eternally.
O.K.\?