One link
The link is the plan. Anyone who has it can open it and answer. Nobody signs up or installs anything.
DuplanMake plans. Max handles the rest.
One plan, one link, no account.
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Everyone answers
Who is in, who is a maybe, who can't make it, and who brings what.
Max, the co-organiser
Max points out what is missing, drafts the messages and suggests who could bring what is still free.