You would be amazed by how many muslims do not practice eating halal over here Mahi 
But my family is strict about it and all of our friends know about this. So there has never ever been any issues. There is always a vegetarian or seafood option!!! Same with the alcohol issue… they respect our beliefs and are very conscientious about letting us know what we should avoid. But usually at these weddings I have attended - there have been very typical desserts that I am very familiar with so this has been a non-issue! At Indian/Sikh weddings, the desserts are the same at ours, and at gora weddings I have seen things like chocolate fountains, chocolate covered strawberries, candy, etc. along with the cake ofcourse! Sometimes the only dessert IS the cake. 
I have gotten some of the usual things… bookmarks, chocolate, a rose, etc. at gora weddings. But I have gotten silver anklets, a little jewelery box (also silver), and this tiny little silver mutkee. lol. I guess it is supposed to be used for some religious thing but my mom uses it to store a spice. 
lol.
Also something really unique is that with a few of our good south indian hindu friends, they have come personally to drop off the wedding invitation for their son or daughters wedding. They come in and actually have a cup of tea. At this time, they give us a box of mitai (typical) AND also give us suits as a “thank you for being our close friend and accepting this invitation”!! And omg … these suits are so gorgeous… already stiched and fancy enough to wear to a shaadi! One for my mother, one for me, and one for my sister. My mom says it is a part of their culture and this is how they show their happiness at this stage!! We have two close family friends and so far this has happened 3 times (2 shaadis in one family so far and 1 shaadi in the other family so far). I am always like wow… who knows how much $ is spent on these weddings!