The DokuWiki has an official #dokuwiki chat channel at Libera.

Feel free to join at irc://irc.libera.chat/dokuwiki

• Server: irc.libera.chat
• Port: 6667
• Channel: #dokuwiki

People without an IRC Client available, can use the webchat provided by Libera (just enter a nickname, connect and chat).

While at IRC it is a benefit to register the nick, so nobody else can use it. Look here for an step-by-step guide: Nickname Registration

• Be patient, users might not answer right away because they may be busy¹⁾. Just ask your question and stay in the channel.
• Please speak English in the channel, so others can benefit from the discussion
• Do not DCC (direct chat) the developers unless they ask you to do that. All question have to be asked in the channel.
• When talking about code use a pastebin instead of posting huge chunks of code.
• If your problem got solved on IRC, please update the documentation accordingly. If you posted about it on the mailinglist or forum before, follow it up with a description of the solution.

The IRC channel is logged by a bot called dokubot. Searchable chat logs are available at https://irc.dokuwiki.org/. When the log is blank, tell splitbrain in the channel. The bot tends to die sometimes and needs a restart then.

dokubot also automatically posts links to bug reports and pages at dokuwiki.org. He also serves a small choice of beverages.

Another bot from Github sometimes joins to announce new commits. He doesn't stay around for talking though.

Sometimes larger meetups (like for Bug Hunting Weekends) happen in IRC. They are announced on the mailing list and forums in advance.