3. Pippa's hen do
Before marrying Prince William in 2011, Kate had a low-key hen night organised by her sister Pippa. The party took place at a friend's house and was attended by a small handful of friends and family.
For Pippa's hen do, it's likely that Kate will return the favour and play a part in organising her sister's 'last night of freedom', but it may not be a hugely raucous affair given Kate's position in the monarch.
HELLO!'s royal correspondent Emily Nash says: "Pippa has a lot more freedom to choose how she celebrates, but will be mindful of her sister's position and will no doubt want to keep any potential hen-do as private and discreet as possible."
Emily adds: "We know that she loves adventure and sport, so she might opt for some kind of activity weekend and could go overseas to ensure the group enjoys sunshine – or even snow. But with her party planning expertise, I'm sure she will make it an event to remember."