What's the best way to plan a shared trip or event with friends without ten group chats?

Planning something with a group, a trip, a big shared event, tends to generate a specific kind of chaos: details scattered across a group chat, a poll here, a shared doc there, and no single place that reflects what's actually been decided. The fix isn't more communication, it's one shared, dated source of truth.

Why group chats fail at this specifically

A group chat is sequential and disappears into scroll. A decision made on day one ("let's do Friday to Sunday") gets buried under a hundred unrelated messages by the time it actually matters, and someone inevitably asks "wait, what did we decide again?" a week later. Chat is great for discussion, genuinely bad for holding a final, current plan.

Put the actual decided details on a shared calendar entry, not just in chat

Once dates, times, or logistics are agreed, even loosely, put them somewhere durable and easy to check back on: a shared calendar event with the details in the notes. Anyone can glance at it later without scrolling back through a chat history trying to reconstruct what was actually agreed.

One person doesn't have to own the whole plan, just the calendar entry

Group trips often stall because no one wants to be the one "in charge." That's a reasonable instinct, but someone should still own keeping the shared calendar event accurate as details firm up, updating times, adding logistics notes, not because they're the boss of the trip, but because a shared source of truth needs at least one person keeping it current.

Attach multiple people to the same event where your tool supports it

If your calendar app supports sharing a specific event or inviting others to it, use that rather than everyone independently trying to remember dates from a chat thread. Seeing it appear directly on your own personal calendar, alongside everything else you have going on that weekend, makes it far less likely you'll accidentally double-book yourself.

Keep the chat for discussion, the calendar for decisions

A workable split: use the group chat for the back-and-forth (should we go here or there, who's driving), and the moment something is actually decided, move it to the shared calendar entry. That way the chat stays for conversation, and the calendar becomes the one place anyone can check for "what's actually happening," without needing to have read every message that led there.