Maido!
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Where
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What
Formatting
Line breaks are kept. **bold** and *italic* work too.
When
Schedule
Set times, talks, courses - anything with its own start time. Guests can add these to their calendar too.
Guest signups
Potluck dishes, setup crew, sound - anything guests can claim. Say how many of each you need; they can also add their own.
Shared cost
A keg, a van, the pitch fee. Guests say what they're in for and everyone sees the running total.
Who
Extras
Also show under
Optional. Pick up to 2 more and this also reaches people browsing those categories.