Your absolute best option would be to eat some salad without any dressing (most definitely avoid vinegar and sugar-based dressings). You will be able to find salads on most menus. Cucumbers, kale, cabbage, broccoli and all kinds of leafy green vegetables are always your best bet. If you plan on having a main course choose fish (just try not to eat a piece larger than the palm of your hand). Other types of seafood are also OK. It is best if these dishes are grilled or steamed. Avoid breaded and fried items. If there are no good menu options and you are still feeling quite hungry look for a boiled egg at the salad bar. One hard boiled egg per week is fine even if you are not trying to find something suitable at a party.
Of course, you would like to know if you will be able to toast to the occasion. Well, perhaps if you opt for red dry wine. Best of all, mix it with water. Nobody will suspect that you are on a diet! Why does it have to be dry wine? It is the kind of wine in which there is no sugar residue. Sugar is something to be definitely avoided as much as possible even by those who are not on the Sadkhin diet. This also means that there should be no sweet dessert for you. Sorry!