Hmm... I would be, for sure!
Im sure Elena, Stefan, Damon, Bonnie, Caroline! Everyone would be there. Because evil or not, they all have known Katherine. And a person, evil as she may be, deserves a funeral where people have forgotten her wrong doings.
Damon is too hot to NOT be forgiven, firstly.
Secondly, it sure is Katerina / Katherine who is responsible for this situation of Damon.
Thirdly, Damon became normal and sweet and nice soon after his return to the Mystic falls. Whereas, Katerina tried to kill Elena, and she did kill Caroline.
Hope this answers
I dont know
Im sure Klaus shall be able to do SOMETHING for poor Katherine, even though she can be called the meanest witch around..!
But Im sure as hell that I wont wanna see her die! She's a pleasure to have around - sarcastic, fun, mean!