Add-on What's the best way to arrange a lottery like this?

[markku]

Maybe there isn't an addon like this, but just asking...

I'd like to arrange a lottery for my members who have posted x messages and been members longer than x days.

And also that manual entry for those who fill these requirements is necessary, so there needs to be a button or something that a member presses and then is given an entry to the lottery.

 

[Digital Doctor]

Cool idea.
I've never seen an addon such as this.