The Congrats app lets you celebrate various occasions of your team members, friends and work colleagues. You can add as many occasions as you like, e.g. birthday or work anniversaries. They can be managed within the administration interface. You can specify how often occasions occur and in which time intervals.
The Congrats Macro can be added to a Confluence page. Specific occasions can be then displayed within a given time frame. In addition, you'll get the possibility to congratulate the users shown.
Detailed information on how to configure the Congrats app, e.g. how to add occasions, can be found on the Administrator's Guide.