Yes, Party Day could be considered a goth band because they play Gothic Rock, which is a core subgenre of goth music. Albums like Glasshouse, Glasshouse / My Heroine / Let Us Shine / Smile, and Sorted! are examples of their goth sound.
Party Day is located in United Kingdom, England, South Yorkshire, Barnsley, Wombwell, active in 1981 — 1988. You can find more information about Party Day on their GothDB band page.