I can't seem to find a browser by Google that runs on the WebOS system. Notwithstanding that I suspect that the browser you are using is not supported. To make sure we will need a Calendar development team member to respond to see what is happening.
JD Lessley Have you tried finding your answer on the ChurchofJesusChrist.org Help Center or Tech Wiki?
After doing some research, the HP Touchpad uses a browser that is Webkit based. I hope that will help the calendar development team figure out why the calendar itself won't load on the HP Touchpad.
Just to calibrate your expectations, you might want to note the thread Calendar No Longer Works on Android Browser. It wasn't fixed until 8 months later with the rollout of a new version. It's not clear to me if the fix was intentional or luck.
Have you searched the Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
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