Nextcloud Calendar
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Simple Calendar
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Getwebstack
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Nextcloud Calendar
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Probably at nextcloud calendar app. Source: over 3 years ago
However, what you're describing seems like any simple Calendar will meet the needs (effectively, here's an event are you coming or not?). Might be overkill, but check out Nextcloud in that case (https://apps.nextcloud.com/apps/calendar). Source: over 3 years ago
I have moved from Google calendar to NextCloud calendar self-host and quite happy with it. I use it with Apple Calendar for creating events, etc. Though sometimes it doesn't sync properly, most of the time, it does the job. The only downside is, I would like to connect my domain/email to the calendar but it is not possible with NextCloud, so it is quite inconvenient if someone tries to invite me. Source: over 3 years ago
If you are a roll-your-own person, you could install and maintain a NextCloud server. See https://apps.nextcloud.com/apps/calendar and https://nextcloud.com/athome/ this is not for the faint of heart. Source: almost 5 years ago
Google Calendar - Spend less time managing your day & more time enjoying it
MarsX - MarsX leverages the power of AI to help users build mobile and web applications using code and no-code technology. MarsX is highly accessible, allowing even non-developers and those with zero building and coding experience to create their own mobile
Etar - Material design open source calendar for Android.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
ProtonCalendar - A secure calendar designed to be paired with the equally secure ProtonMail service.
Rainlendar - Rainlendar - Customizable desktop calendar