This Chrome extension adds "Google Calendar" buttons to any WisCon event page, e.g. http://wiscon.piglet.org/program/detail?idItems=1944.
Clicking the button brings you to a page that allows you to save the event, with the description, moderators, etc in the right time zone on your calendar.
Extension: https://chrome.google.com/webstore/detail/wiscon-program-helper-for/kabfoinpjdpebhmfcmbjljkgfdkhebne
(Disclaimer: this project is not a Google product.)