You would like your constituents to purchase raffle or ball drop tickets on your website. These purchases require a unique identification number be issued at the time of sale.
Each order on your system (including registrations, product and sponsorship sales) receives a unique order number (101, 102, etc.). These numbers can be assigned to the buyer for raffles or ball drops. Note that if someone purchases two products in one order (ie raffles or ball drop tickets) the administrator will need to assign numbers to the tickets, such as 101a & 101b.
Simply enter your ball drop or raffle tickets as products as described here.