Meg: I'm seeing my girls sat night. Do you want to join us?
Eva: Yeah, sure! :) Are you staying in or going out? 
Meg: Staying in. My place. At about 8.
Eva: Oh, ok. Do you want me to bring anything?
Meg: a bottle of wine and some snacks please
Eva: Sure. Thanks for inviting me! See you sat night then ;) 
Meg and her friends are meeting at her place on Saturday at 8. Eva is going to join them.