I asked a similar question yesterday: How should "come" and "go" be used in the following context?
It's been answered, but I showed the answers to my mom and she gave me this example in response:
Say your friend invites you to a party. The party will be held at your friend's house. At the time your friend asks you, neither of you are at your friend's house. Your friend asks "Are you coming (to my party)?" Do you say
Yes, I'm coming / No, I can't come
Yes, I'm going / No, I can't go
Or do you just say "yes" or "no" to avoid confusion?