Chris ... will bring his girlfriend ... OK. Chris ... will take his girlfriend ... OK.
Alice ... bring her guitar ... OK. Alice ... take her guitar ... OK.
The speaker considers himself (or imagines himself) at the destination (of Chris and his girlfriend or of Alice and her guitar) when "bring" is used. The speaker considers himself (or imagines himself) elsew
The only difference is in formal and informal writing. Generally, to bring something somewhere is to move it toward a point of action or request. To take something is to move it away from that point. When the point of action or request is not the destination itself, it depends on the context of the sentence, i.e., Alice says that she is planning to take/bring her guitar to play with us, as you ha