Nikkah/wedding Anniversary is not particularly celebrated as a Pakistani ritual. It all depends upon the couple whether they want to make a big deal out of it or not. They can keep it just between themselves or throw a big party at the end of the 1st year of their union.
In circumstances where rukhsati hasn’t taken place, no celebration is done on a family level but couples do like to exchange cards, gifts and perhaps, dinner if their situation permits. Many families look down upon the interaction before marriage in arranged marriage cases but it really depends upon the mind-set of the families.
Look here if you want a few gift ideas for the groom: