To my knowledge, not easily. Technically, GPE-Contacts can import vcards, but I haven't found it to be reliable enough to be useful. If you search the forums, someone wrote a java app to migrate contacts from Palm like so: Export Palm contacts to vcard, run java app to generate sql statements from vcard, run sql "script" using a desktop version of sqlite, copy resulting contacts database in ~/.gpe and voila. A similar technique can probably be used for your calendar, if you can generate vcal. But it'll be a pain unless you're the type that likes jotting off such short scripts.

When the java app complained about some missing something or other on my linux system, I just spent a couple hours on the bus copying the contacts from my palm.