Contact your LSP if you need Webinar or Large Meeting options (500/1000 participants) for your Penn Zoom account.
Note that the options available to individual users / the general public through the Zoom website cannot be applied to Penn-licensed Zoom accounts. That is, you cannot purchase a month / subscription for webinar or large meeting capacities on Zoom’s websites and apply it to a Penn Zoom account.
For department/users in the School of Arts and Sciences, 1-day and annual licenses are available at a charge.
Some more info is here: https://www.isc.upenn.edu/how-to/zoom-resources-it-staff#FAQ