What will happen post Kalki period ? Will all the events take place again, viz. Churning of the Ocean, Ramayana, Mahabharata, and so on.
End of kaliyug, start of satyug events
Having exterminated the thieves and robbers, Kalki(chakravarti samrath;avtar of shri hari) will, at a great ashwamedh yagya duly give away this earth to the Brahmanas.
Mahabharat Vana parva Section CLXL
And when those terrible times of kaliyug will be over, the creation will begin anew. And men will again be created and distributed into the four orders beginning with Brahmanas. And about that time, in order that men may increase, Providence, according to its pleasure, will once more become propitious
And then when the Sun, the Moon, and Vrihaspati will, with the constellation Pushya, enter the same sign, the Krita age will begin again.
Events will happen again
From bhagvad gita
यदा यदा हि धर्मस्य ग्लानिर्भवति भारत | अभ्युत्थानमधर्मस्य तदात्मानं सृजाम्यहम् || 7||
परित्राणाय साधूनां विनाशाय च दुष्कृताम् | धर्मसंस्थापनार्थाय सम्भवामि युगे युगे || 8||
Whenever there is a decline in righteousness and an increase in unrighteousness, O Arjun, at that time I manifest Myself on earth. To protect the righteous, to annihilate the wicked, and to reestablish the principles of dharma I appear on this earth, age after age.
So mahabharat and ramayan will happen again as avtars of shri hari come in every age.
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But churning of ocean won't happen as
Bhagavad Gita chapter 8 17-18 One day of Brahma (kalp) lasts a thousand cycles of the four ages (mahā yug) and his night also extends for the same span of time. The wise who know this understand the reality about day and night.
At the advent of Brahma’s day, all living beings emanate from the unmanifest source. And at the fall of his night, all embodied beings again merge into their unmanifest source.
Means devtas are born at start of kalp then they won't require amrit in every yug.
One kalpa equals 71 * 14 = 994 yugas.
Hence, no churning of ocean