As someone who is a professional event photographer who also enjoys attending and participating in events, you're not going to like my answer: you really need to choose whether you are part of the event or documenting the event.

If you're involved and engaged with friends and family, that's where your attention is going to lie. If your goal is a set of photos that reflect all that is going on and a good portion of the attendees, then by definition you'll need to "be everywhere" and move around to capture a lot of different scenes and people.

The exception to this is where your photography is part of the event, such as a photo booth or such. In that case you're both working and engaging, but you're still going to be focused on the photography which means that if there's something fun going on in another part of the room, you can't be part of that.

It sounds like you're doing this as a hobby and not as a paid event photographer, so these are simply suggestions. If you're getting paid (or otherwise being expected) to cover the event, the line is even clearer: you're not being paid to socialize, you're being paid to photograph.