depends from family to family.. Mayun--girl's side Nikah--girl's side Mehndi--if separately done...its girl's and the guy's side respectively. Shaadi--girls side Valima--guy's side Jahez--girl's side Bari--guy's side Honeymoon--guys parents...or a generous mamu/chachu LoL..
thts exactly how it is!
u can have one mehendi and divide the cost or just have ur own and each pays for their half.