My wife and I are kid free this weekend and she has agreed to get me messy. I am looking for suggestions of games or something I can do to make it fun for her. She won't be getting messy and isn't really a fan of me getting messy. Whatever we do needs to be simple.

Any suggestions?

You may have already done this but if possible try asking her what would make it most fun or enjoyable for her. If she's unsure, you could suggest some options - simple games could include 'battleships' where every time you hit a 'ship' you get messed, or you could play the yes/no game (she asks you questions and you must answer without using yes or no) - every time you mess it up again you get messed up!

Alternatively would she prefer to role play punishing you or similar?

I have been there myself with a partner who is willing to participate but says 'it's your thing, just tell me what to do' but we've found over time that if she can have some input it's so much more enjoyable for both of us. If you can, gently encourage her to give her ideas and let her know you're keen to incorporate them. Have fun at the weekend!

Quiz. Chess, draughts, battleships or ludo with messy punishments for each take/hit she gives you?
Memory game - get 100 cards write messy things on 20. Let her look at them, then turn them over. She gets 20 picks - you take any messes she finds.

I wish she would be up for punishing me or role play but I highly doubt she would be up for it. She wants to keep this simple.

I had two ideas. 1. We sit outside at night and she blindfolds me. We have a conversation and the she surprises me with a pie. 2. I right down some messy tasks that we can "pull from a hat". Any ideas of simple messy tasks?

Your last question was: "Any ideas of simple messy tasks?"

All she has to do here is pick out three slips of paper from a cup. You have written five body parts, one on each slip, and maybe one extra like "in my pants." You make 1 to 3 pies - just something mounded on a paper plate. I used to choose one that was kind of sticky or gross.

You can change these numbers of course.

All she has to do is pick out the slips of paper. You can do the pieing yourself.
Hopefully over time she'll see this puts you in a good mood or an amorous mood and she'll enjoy the game.

Good luck. And make sure you say to her that anything she ever wants to do you're up for.

Realistically, this sounds like your wife is doing this reluctantly, so she wants the whole thing to be over and done with as quickly as possible. Based on that, my advice is to set up all the mess in the bathroom (e.g. some pies and a bucket of gunge) then bring her in and say "Let me have it!" She can splat you with the pies, tip the bucket over your head, then leave, and it should only take her a couple of minutes. You can then handle the clean-up.

More generally, I think that a situation like this will depend on what the other person likes. E.g. if you both play chess regularly, then you could say "Every time you take one of my pieces I'll get pied". That way, aside from the mess, it would hopefully be a fun activity for her. However, if you never play chess normally, that would just drag the whole thing out. Ditto for any other board games etc.

Putting it another way, if you have a game that involves forfeits, you can keep the same mechanics and substitute a different forfeit. E.g. if you start with a drinking game, that could be amended for a stripping game or a pie game. You could also give each person a choice of forfeit; your wife would presumably choose "drink" or "strip" every time, but it would keep her involved.

I think you need to get to the bottom of her reluctance before you do it at all. It may be she feels that if you need a kink like this to get you off, that means she (and sex with her) isn't "enough" for you as it is. If you have a WAM session that she's only reluctantly participating in, even a simple one, it could go badly as a result and put her off doing it again. I would try to explain that your kink has always been part of you, and make the session about her as much as possible - tell her that it's not about you getting off on being messy in an autoerotic way (or it shouldn't be, at any rate), it's that you love submitting to/being dominated by a beautiful woman. That way you're complimenting her and making the session an extension of your loving relationship.