By Aditi Shah and Aditya Kalra NEW DELHI, Oct 28 (Reuters) - Asia’s richest man, Mukesh Ambani - known for throwing lavish weddings for his children - is splashing out again by celebrating. Mukesh Ambani hosts a lavish gala featuring drones, food stalls and DJs near a helipad following record market debut bids for the Reliance digital venture in Mumbai, India.