Nosta now renders calendars and events.

https://i.nostr.build/Zvll.jpg

Not many profiles use this feature yet. Here's an example:

https://nosta.me/17717ad4d20e2a425cda0a2195624a0a4a73c4f6975f16b1593fc87fa46f2d58

As with other content, Nosta is just showing the info. Interacting with calendar and events, scheduling your own, etc, is left up to dedicated third-party clients (micro apps). These events link out to Flockstr at the moment, but hopefully there will be more adoption of recommended handlers, and then users are linked out to the service of their choice.