Few chat apps have a true built-in calendar
Most global messaging apps don't include a native shared calendar inside the chat itself, so pairing the chat with a separate calendar app and sharing the link is the most reliable cross-platform approach. This varies by app and region -- some regional messaging apps do offer a built-in scheduling feature, so it's worth checking your specific app's menus first.
Updating the event updates it for everyone
Because the group is looking at the same shared event rather than separate copies, changing the date or time in the original calendar event automatically reflects for everyone who added it, without needing to re-announce the change in chat.
Frequently Asked Questions
Do all participants need the same calendar app to see the event?
No -- most shareable calendar links open in a browser or can be added to whatever calendar app the recipient already uses, so an identical app isn't required.
Can I set a reminder so people don't forget the event?
Yes, most calendar apps let you attach a reminder notification to the event itself, which then applies to each participant who added it to their own calendar.