Can it possible to add sub forms in the form builder?

Till now I have created a simple forms in the form builder. But Now I need a create a form which may need a kind of sub form in it. Let me explain my scenario first. I have a form (Users) where I can fill all the user information. Now I want to add the activities/Events list for the respective user. Here Events is kind of form with 5 or 6 fields. Each user will have multiple events. How can I add events sub form for the users form?

1) Can it possible to add a sub form (Events) for the Users forms? Or Can it possible to add a separate section for Events in the User form and able to add multiple events (Dynamic) for that respective user?

Please suggest some solution for my issue.