How do you use your welcome in a sentence?

Excuse me, could you please explain how one might effectively incorporate the word "welcome" into a sentence? For instance, in a professional setting, would it be appropriate to say, "You are welcome to attend our upcoming conference," or perhaps in a more casual context, "Welcome to the neighborhood, feel free to stop by anytime"? I'm curious about various scenarios where "welcome" could be used appropriately and meaningfully.