QGIS has a bunch of mailing lists. See Mailing lists for the different available lists.
If you are going to ask questions please read this: How to ask a QGIS question?.
Nabble (http://nabble.com) keeps a history of a lot of mailinglists.
If you go to the osgeo section of it: http://osgeo-org.1560.x6.nabble.com/ you see there is a QGIS section also, where you can do a search over all QGIS lists, or refine it to e.g. only the users list.
There is a lot of user and community related chat (english spoken) on the Telegram channel you can join here: https://t.me/joinchat/Aq2V5RPoxYYhXqUPoxRWPQ
To join: install Telegram on your phone, register and join via link above.
There is also a web version (https://web.telegram.org) which you can join in the browser (after you joined telegram via your phone(number)).
Matrix (https://matrix.org) is a project for decentralised chat. QGIS has a room accessible by the #qgis:osgeo.org alias (among others) which bridges to the libera.chat #qgis IRC channel.
To use Matrix: create an account (at matrix.org is easiest, but if you have an OSGeo account you can also use your OSGeo id as matrix id), install a client (Elements is easiest, but see https://matrix.org/docs/projects/try-matrix-now/#clients for more), OR point your browser to (https://matrix.to/#qgis:osgeo.org)
Local QGIS user groups are a great place to meet other users.
See User Groups to read about it.
The website should be used to publish any material in relation to the information and management of the user group. Examples include the user meetings, case study, shared material, discussion boards, etc. Public material should be available without login requirements (e.g. do not require interested people to be a member of a social media network like Facebook or Google+). Usage of social media is recommended but should not be the only channel of information. RSS feeds should be made available at the Website of the QGIS user group.
Good luck with the organization of your local user group. Please inform the international QGIS team by registering at the QGIS community list and reporting about your progress. Please do not hesitate to ask questions regarding the establishment and maintenance of your local user group.
You can also get support from companies near you, please visit this page: Commercial support.