Why is Rick having a party?

W: I completely forgot that today is Rick’s housewarming party.(59)I forgot to get him a gift, and I don’t think I’ll have enough time after work to go shopping. I’m going to run over to the mall during lunch.(60)Do you want to go together?
M: Sorry, Jean, but I am meeting someone for lunch today. Plus, I already picked up something a couple of nights ago.
W: I see. I guess I have no choice but to go alone then. Anyway, will you be taking your car to the party tonight?
M: No, I’m getting a lift with Eric. My car conked out on me last night, and it is in the garage today.(61)I had to take the bus to work this morning.