Okama humor contest. Make a cross-dressing character of either sex and make them as tacky, insane, and backwards as possible. Similar to the originality idea. This would be judged based not only on how unique the character is, but on how thorough, ironic, and powerful you can make the character without it being OP or an extremist. Instead of one judging factor, this has five and it must be an Okama.
Debate contest. Certain selected individuals who wish to be part of the debate without competing will search for debate topics throughout the one piece series that does NOT include what has yet to pass, such as if a new member will join the straw hats or who will get the mera mera no mi. The topics would be more like "enel vs whitebeard", "is the ricky cheetah guy a strange human, or did he eat a devil fruit", or "does the guy with food on his fact have a devil fruit". This idea is a double contest. Those who come up with the best debate topics will be rewarded somehow, and then the actual debate comes into play. Those who take part in the debate rely on their knowledge of one piece and their ability to form quick counter-arguments to debate the pro-side or the con-side. The person will not know their topic or position until it is taking place. There will be three judgment factors: bias, knowledge, and logic. Bias means that your opinion either has no bias, or seems to have no bias to the reader. Knowledge is just how much you know about one piece. Logic is how well you fought your position. Each individual will be rated from 1-3 on each factor. The winner of the debate shall be voted upon by the public. The winner gains one bonus point. If they have done as best as possible, they will gain 10 points. This will be repeated so that everyone has a turn with everyone. Teams could be implemented, if a lot of people like the idea. The one with the most points in the end will receive all the prizes, and then each down the list will get one less prize in concept. Like top 1, top 2, top 3, top 5, top 10 stacking prizes.