We don't know any good PartyLabz open-source alternatives yet.
You are more than welcome to suggest any alternatives that you know of, or ask the community for suggestions.
Alternatively, we recommend checking out LibHunt for open-source libraries and alternatives to PartyLabz.
PartyLabz helps make planning your event easier. You can send invitations (email or text), collect RSVPs, and engage guests with polls and signup lists. Use the built-in checklist and budget tools to stay organized and keep track of your planning activities and expenses.