That depends on a lot of factors. Your character, your performance style, the people for whom you're performing, and the overall vibe of the event. Oh, and also whether you've been hired to perform, or are just a guest doing some magic.
In general I will do my energy transfer routine for any event that is 'relationship' themed because it really emphasizes the connection between the people. But if I were hired, I would probably just do my normal show and emphasize happy relationships to be encouraging to the guests of honor.
For Birthdays I would simply gear the show towards the birthday person's tastes. I would do the same material, just tweak the script for the event.