. . . . so we will have a dinner party Thursday October 4 at 7pm at my new house.
I think the ordre of the phrase in bold is wrong, and the right order is:
. . . so we will have a dinner party in my new house at 7 on Thusday, October 4.
I would say:
We will have (or "There will be") a dinner party at my new house on Thursday, October 4th at 7pm.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.