How To Ask People For Contribution At Wedding When's The Right Time To Ask For Your Families Contribution For Your Wedding?

When's the right time to ask for your families contribution for your wedding? - how to ask people for contribution at wedding

I'm getting married in August 2009. The parents of my friend, "said my mother, my father and my aunt to help everyone pay for the wedding. I do not know whether I should continue to plan and pay with my credit card and then the money we received as a gift for the wedding or after. Or I may ask, do not exceed (for certain things in the planning of what they have agreed to pay a contribution, of course).