How differently should you approach a first date with her friends involved ?

Let's do some theory for once. Let's say it's a first date at the local skate park, there's beers a small gig and lot of rooms to sit down. Chill vibes it's the summer and it's outside There will be her long time friends and even her sister at the event.

How do you approach it and how different is it than your typical date ? What does the presence of her closest friends mean what does it do? What does it mean that she invited you ?