You can enter at different level and evolve
There are three different ways to get involve on the website :
first you can go on your own and look for a challenge to do on your own. For exemple : make your own dress. (or print in 3D!)You go on the website. You go on textile/clothes/dress/. You will find associations and events around your localisation which can help/ feedback (video/post) of other people. You can find other people to build a team if you want
Then you can come as a group and challenge other groups. You're into cooking or sports! you can challenge an other group : for exemple do a dinner for your group for less than 5 euros/dollars/....The website will allow people to find other group depending on the type of challenge, the geographic localization. Once you find the group, you challenge it. The other group can accept or not. You can challenge on a team in a different country on a human pyramid for exemple (it's really an exemple) or meet an other group in Paris to canoe on the Seine. You can also challenge on matter questions.
You can also evolve in a bigger community as a group or by yourself. You will find all kind of challenges and meetup of different communities like OpenIdeo or Make Sense and other platforms.