Kierunkowy74

Asked a few qoto users, you actually are able to add a hashtag view as another column.

https://c.im has 5000 characters limit.
https://kolektiva.social (anarchist) has 10 000
https://infosec.exchange has 11 000 characters and formatting.
https://qoto.org has 65 535 character limit and other features, but some servers (including Universeodon and main British one - mastodonapp.uk) block it.

You probably want to use a regional instance to have more relevant users, groups and events, but there is a global search engine for Mobilizon

For example, I am using a Polish instance, with an unsuprising domain https://mobilizon.pl

With an account, you are able to publish events, with header image, title, category, tags, date, place, description (with formatting available), and metadata. The event can be accesible publicly, or only via link.
The event (if public) can federate (and be boosted to e.g. Mastodon) and be commented, but you are able to turn off the comments.

Individual account can only be followed from Friendica, but not from Mastodon.

For more features you want to create a group. A group can be followed from Friendica and Mastodon, but only Mobilizon accounts can become its members. Group members are able to participate in discussions (not visible from outside), manage a "common resource folder" - links, make group events and group announcements

You can experiment with Mobilizon features with a demo instance

There is already a Meetup alternative - Mobilizon

Friendica provides blogging, microblogging, pictures, friend circles (but they work only for Friendica users), and multiple identities managed by single login.

And there is a fediverse marketplace software - Flohmarkt - instances

The newer ones are:

• Mbin, a recent fork of /kbin - fedia.io is the largest server,
• PieFed

Lunar supports both Lemmy and /kbin

Already available on /kbin.
(but no instance blocking on our side)

For example, Threads supports audio posts, a feature not currently supported within ActivityPub(...)

Laughs in Funkwhale, Castopod, and even any ActivityPub platform implementing an Audio object type

Wired checked no Meta claim against reality.

Lemmy joins /kbin and mbin, which already were able to interact with Guppe groups

Proposed solution 2: Multi-communities

They are already implemented on /kbin - as Collections

kbin.social is only PWA right now. There is Interstellar app for Android being developed right now, but it is available only via Github releases (no Google Play nor F-Droid). And it works only on https://kbin.earth (or instances of /kbin fork called /mbin) right now.