Marriage registration

1. For registration of Marriages in Delhi click and understand yourself from link -

https://delhi.gov.in/wps/wcm/connect/DoIT/delhi+govt/community/marriage+certificate+and+registration  

2. Yes, you can Register marriage at any other place such as 'home town' provided documents produced shows 'other place' relevance.

requeirment

1. Application form duly filled and signed by the bride and the groom.
2. Fee of Rs.15/- is to be deposited with cashier of District and the receipt should be attached with the form.
3. Documentary evidence of date of birth of both parties (Matriculation Certificate/Passport/Birth Certificate).
4. Documentary evidence regarding stay in Delhi of one of the parties for more than 30 days (ration card or report from the concerned SHO).
5. Separate affidavits from bride and groom giving:
   1. Date of birth.
   2. Present marital status: unmarried/widower/ divorcee.
   3. Affirmation that the parties are not related to each other within the degree of prohibited relationship defined in the Special Marriage Act.
6. Passport size photographs of both parties (2 copies each) duly attested by a Gazetted Officer.
7. Copy of divorce decree/order in case of a divorcee and death certificate of spouse in case of widow/widower.