Not the way I did it...knock out the drunk in the barn with the non-lethal syringe and take his clothes & invite, run up through the front door and to the left through the bathroom and out the window, wait about 10-15 seconds for 1st target(father of the bride?) to come out onto the back porch, kill him and hide him in the bushes, go back inside to the kitchen and use the poison syringe on the wedding cake, start making your way to the exit and about the time you get there the husband will sneak a taste of the cake and die.
Sounds like a lot in just a little time, and if you hesitate any u could miss the 1st target, but its a very effective method.