It's good to invite people to fun events.
Luke spoke to Han because he wanted to invite Han over to a BBQ with his friends.
Luke wants to talk to Han.
Luke invites Han to the BBQ with his other friends.
Luke talks to Han about sports and games and such and forgets to invite him.
Han is excited to go to the BBQ with Luke and friends.
Luke is upset because it would be more fun with Han there.