If this is not an event for bear lovers, shave. Actually don't shave, shaving is bad for the skin. Find a gentle chemical hair remover. READ the label, most of them strongly urge you to not put them on things like nipples.
It puts the lotion on the skin, or else.... Just keep saying that and doing that every day, twice a day if time allows (once in the morning, once in the evening) it should lead to a 'glow' and 'shine'. On the day of the event, just before 'butlering' apply more lotion.
Lotion, something with a nice vitamin E content should do nicely. on the day there of if outside, wear one with some UV protection.
Lose weight fast - cut something off.... Lose fat and tone up, exercise and diet. I think you already know this. BTW if your photos are current, you do not need to lose anything.
As for how to deal with people.
Assuming there is no 'Do Not Touch the butler' rules, you will have to nicely direct the attention upward and out of your way when serving if 'touching' is taking place. Gently, but firmly remind the 'guest' that there is a rule about touching. If this is an organized event, you most likely will be coached on how to say the right things to disarm the handy guests.
If its their first time and they are sober, they most likely will just look - hard, but be too 'shy' to touch. If they are drinking, expect grouping.
If this is not one of those places that require showing tube in the pants, I suggest wearing a cup to protect your "junk" from the drunk. There are some who will grab a hold without mercy. Also expect the drunks and more wild ones to twist tits and do other things like ass slap and maybe even try to bare more.
Again I have no idea what the ground rules may be, if they are strict you most likely will have no to little problem. If they are no strict 'rules' given to guests, then expect to go home feeling used and abused physically and even emotionally. Stripper, dancers, posers, half nude people tend to get poorly treated by lots of the 'guests' unless there are strict rules, even then the rules don't stop drunks and just 'wild' crazy people.
Smile, and smile and smile some more. DO expect lots of crude comments, 'sly' whispers and suggestions. Just keep on smiling, I don't care if that guy is 105 years old, 5'4 tall and 6' wide. Smile.
Winking - Bad. Unless you know the guest is shy, or not going to maul you. If there is any doubt about how drunk or how willing this guest is do not provoke him or her with a wink.
Careful of drunk husbands/wives who see you paying attention to their spouses. While most are not very jealous when sober, jealousy can flare up when drunk. A few don't need a drink to get 'upset' that you just looked at their spouse.
I will assume this is an organized affair, organized by a person who has had some experience. S/he will most likely tell you pretty much what I told you, most likely a bit more and some solid, practical advise how to deal with 'restless natives'.
Since you are a week away, I would strongly suggest you discuss protocol BEFORE the big day. Different parties have different rules and expect different things from the help (you).
Lastly, do try to have fun.