Get Together is incredibly versatile! It took me forever to figure out how to use it in my gameplay because they couldn't really advertise it well enough to cover what it can do for your game.
I use it for family play, but it's not what you would think of as a club. They do normal everyday stuff (such as homework, watching TV, reading, showering, being friendly to one another) and rack up points for it to get benefits that help them.
IF we ever get Witches and Werewolves, I will have covens and packs. You can create Vampire broods now, but it doesn't feel right without a rival group.
If you have the Rally the Troops benefit, it can help to make up for the fatal flaw of not being able control Sims in more than one place. If a Sim is off the home lot, the Sims left on the lot will not be productive. Rally the Troops will give a 1/3 boost for hunger, bladder and energy (and there is no cool down time for using it) so your Sims have less needs to take care of and can finish homework or raise the skills they need despite not controlling them the entire time.
Some people create skilling clubs. Others do things like "cleaning" clubs where they call a gathering and have other Sims clean their house for them. There have been so many ideas that go beyond what you would think of as a club.
