Rimi
Glad to see you here again. Yeah, this thread is there in Mythological Masti, as well as in Dwarkadheesh - Bhagvan Shri Krishn, all covering more or less mutually exclusive subjects. Of course, since Ramayan thread is frozen, any Ramayan related questions would go to Mythological Masti, except for ones like the one I asked above.
Samudra manthan - it happened in the Satya Yuga, since Treta Yuga started w/ the killing of Hiranyakashipu. I don't think Shiva had either Sati nor Parvati w/ him. I think it might have been during the interval b/w the demise of Sati and the birth of Parvati. In fact, some stories have it that during the Samudra manthan, Shiva was attracted by Mohini and wanted to find out more about here. Probably later, to kill Mahishi, they both begat a son Ayappan.
On Lakshmiji, I find her origins pretty confusing - if she was the daughter of Bhrigu/Khyatti, how did she end up w/ Varuna? Remember, in Kurma avatar, when the ocean was churned, she appeared, and then married Vishnu, who was organizing this entire activity. So according to that at least, she'd be the daughter of Varuna. Besides that, does the serial indicate that Khyatti is currently married to Bhrigu? I seem to get the impression that all these ladies are yet unmarried, or why would Kashyap be roaming about one place, while Aditi et al are all w/ Sati? But at this time, they'd be married, no, since Daksha's friends included the devas like Indra, who fought on his side against Veerbhadra?
P.S. Somebody please answer my question above (the first on this page) on whether the wife of Bhrigu that Vishnu killed was Khyatti?