Birthday girl?

How embarrassing, being spanked in front of the dinner guests..

not less than 400/500 spanks

looks like more than one lady is being spanked over the knee a spanking good party

She's wearing a garterbelt/stockings and I see people behind her. This is most likely taking place at a spanking party (get together) held regionally by different organizations (I know because I attend many.)
Sometimes there will be a fun raffle off of a beautiful wife/GF where the money goes to charity and it's a $1 per spank. The goal is to see how many she can take. Usually 150-300 hard hand spanks depending on the spanker.

every cheeky arrogant woman needs this from time to time

I'd love to be the lucky one spanking her sweet ass