'party host' is a correct and usable phrase in written English.
You can use it to refer to someone who hosts a party. For example: My aunt is the party host for the family reunion this year.
The ultimate decadent party host.
She became a karaoke party host.
Need a gift for a party host (or yourself)?
Alexander Provan, a party host and a founder of Triple Canopy, searched for more beer.
Two months later, through their dinner party host, a date was arranged.
"We don't advertise," the party host, and self-proclaimed "purveyor of rad," Alexis Mincolla, tells me.
F. M., New York City Party hosts are not Arab Spring dictators.
There will be a (free!) post-prelim pizza party hosted by the ACSU Association of Computer Science Undergradss) in Olin 145.
From there Marci parachutes into a chic party hosted by the obligatory men in Chelsea.
I last saw her at an authors' party hosted by a major London bookshop.
Huh? Anyway, the ads built to a trendy-looking party hosted by none other than Nolan.
