HebCal loads into our site. I'm wondering if there is a way that the verbiage can be in Sephardic transliteration as opposed to Ashkenazi? Sukkot instead of Sukkos, etc.

Hi, thanks for contacting us!

The Hebcal website and APIs support 13 different languages for event titles. By default, Hebcal uses Sephardic transliterations. To transliterate event titles in a different language, specify lg=LANG parameter using one of the following values listed on this page.

https://www.hebcal.com/home/4534/jewish-calendar-event-language-support

If you're seeing Ashkenazic transliterations, this means that your site is using lg=a or possibly a very old  a=on  API parameter.

Change to  lg=s   and remove any occurrences of  a=on  and you'll be all set!