In my contract there is a line that states… “The customer is fully responsible for the proper handling and serving of the cake once delivery is complete”. If it is an alchohol cake I do put “This cake contains alchohol” in the notes section (I do the same when its nuts). That way I am “legally” covered, the cuistomer has been made aware that it it in there and it is thier responsibility to see that it is properly served. Generally speaking though, the amount of alchohol in a loquor cake is negligible and most people will think nothing of it.