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Currently, Australian borders are closed with few exceptions to foreign nationals due to Covid-19 pandemic. Parents of an independent adult are not considered immediate family for the purpose of exemptions. Weddings are also not usually considered a compassionate and compelling reason to travel.
At this time, even if you obtain a visa, you won't be allowed to come to Australia without good reasons and an exemption by the Australian government.
https://covid19.homeaffairs.gov.au/coming-australia
When things return to the normal:
Yes, Australia requires a visitor visa for holders of 1951 Convention travel documents (blue).
Only a citizen of Germany (or other eligible countries) with a valid passport is eligible to visit Australia under eVisitor scheme.
You cannot apply with:
- a non-citizen passport, certificate of identity or other travel document
https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-listing/evisitor-651#Eligibility
You can apply under the tourist stream or sponsored family stream (if your daughter is eligible). You can find more information here: https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-listing/visitor-600.