Very thoughtful friends, they found you to witness everything between them, it is a very romantic thing to think about it, so you should also bless them for being lucky enough to witness the whole process of this happy couple. You should bring a gift to attend their anniversary. Of course, you must not be an ordinary friend to attend all their ceremonies.
However, there is no need to spend too much money, this should not be the original intention of friends, bring some interesting gifts, first of all, it is a must to bring a bouquet of flowers, and then you can choose a simple creative gift.
Secondly, you can use the photos of your friends and their couples to make a pair of real dolls of them as a commemoration, and put them in their homes for many years, and they will still remember such a group of friends.
You can also give a pair of couple cups, creatively put their photos on them, and they are inseparable at all times, which is a good meaning. There are also other gifts, you can choose and see, there will be a gift you like.