Local Convention Support

I'm pretty excited to announce that I am running a paint and take event at our local ESCON 2016.  If you are in the San Diego check it out.  Its always good to support our local Cons.  In addition to the above event, I am hoping to have a prize in the raffle.  Not sure what that will be yet as I am still working on ideas, but I am thinking something like painting some board game miniatures for free.  How many do you think would be a good number?  I was thinking something like six for free depending on how involved they are.