Oh wow, Rob's come a long way! Fantastic that this is getting covered here.
To those who are interested to know, this charity was started by a British TF fan. He lows to draw and does so regularly. Each year during lent he organizes this and tries to draw as many pieces as possible to auction off and raise money for charity.
That way he gets motivated to get even more practice, improve and do something good.
I think this is the first one where professional comic artists actually join in, but yeah, originally it was just him.