Answer is No. as stated in one of reply above, Mandir is driven by organization who are followers of Lord Swaminarayan. No appointments needed, check mandir timings & visit. 🙏
BAPS is a very big hindu organization worshipng and following the path to live shown and written by Lord Swaminarayan and the organisation has many saints and gurus and very very strict norms and conditions and requirements to join them and become a Deciple its not a easy process and may take years also
Sorry, I don't know. I was just sight visiting.
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