What should I do in the yearly group event? I am a first year PhD student. In our group there is this tradition of going to a small village town during an extended weekend and giving presentations. 

Being a rookie in the group I have never participated in such an event. I have no idea what it is about. Is it about science, is it about fun, or else?

I asked other senior members of the group, they said it is a mix of both.

Obviously, I have to present something in this event and looking back at my work so far, I feel horrible when I compare it to the other PhD candidates. Yes they are seniors and have done more, but still...

Is it worth including these topics in my presentation:


the topic of my research (should I explain in detail what it is, and how it works?!?)
the project I work for
the students I supervise
misc...


Has anyone else participated in such an event? What is its purpose? How to appear good although I am the rookie in the group? What is the tone of the presentations in such an event?
Just talk to your colleagues, ask them to show you their previous presentations. It's perfectly fine to be afraid to make a mistake and ask "silly" questions.

Here's what I would do: tell about your previous research, if you are from different country/uni - maybe show some pictures. Then tell about your project - even if you don't have any results (and it's ok) you can talk about your research plan, experiments you plan to do. It's good to have feedback/suggestions from seniors at this stage.

Then, if you're new - you can introduce yourself to others, maybe have one slide with pictures that represent your hobbies, etc.