Covens - that is a choice, if you enjoy being with other people and learning from other people covens are a good place to go. Although it is hard to find a coven that is already made up that you will fit right into. There are many different personalities involved but everyone in a coven has their own level of practice, things they are good at. It would be a good place to learn, because by most means it is a safe place. There are also different types of covens. It is definitely worth researching. But it is a matter of a choice.
However for celebration of the pagan/wiccan holidays it is always good to amongst people who share your interests but you don't have to.
The city I live in has open rituals for Samhain and Yule and many of the other pagan holidays you can choose to join them or not.
One thing I would say is that when they do festivals you go to at least one or two of these. They often are there to help the community and to give site to the people that we are not BAD people sacrificing animals and having blatant sex acts in public. Also much of them are to promote the farming communities that grow our food, people who work hard.
So there is my take on covens and such.