For a baptism of a baby the grandparents and other relatives and friends are invited. You can buy ready made invitation cards for the christening or baptism, but such cards usually look very classic and not very personal. Invitations for baptism can also be made by yourself. A nice idea is to take a picture of the baby and write some texts and phrases on the back of the picture and send it out as an invitation. You can either label the photo directly using your computer or edit the photo and add some text. When you make your own cards you should keep in mind to use the format of a postcard so you can put it easily into a standard envelope.
For the wedding the bride and groom get many gifts and presents. Currently there is a trend to make the wedding guests small gifts, too. The name for this kind of gifts is wedding favors. Usually, this is a memento of the wedding and the celebration. Disposable cameras are very popular as wedding favors. Anyone can make a few snapshots and get personal photos from the wedding ceremony. A wedding newspaper is also often a nice wedding favor for the wedding guests. Other popular favor ideas are a bottle of wine with an individual label or a thank you card with a photo of the bride and groom. Whatever you give to your guests - it is certainly a nice idea to make some wedding favors so all friends and relatives keep the wedding in memory.