In this sentence, "that brings us to" means "that leads us to the next point" or "that naturally makes us think about." It's a way to transition the conversation to the topic of what to bring.

We are now going to talk about.....

In this case, the previous conversation was about inviting friends to an event. The phrase "that brings us to" is used to shift the conversation to the next logical question: what should they bring to the event.