GDAL’s community interacts through Mailing List, GitHub, and IRC. Please feel welcome to ask questions and participate in all of the venues. The Mailing List communication channel is for general questions, development discussion, and feedback. The GitHub communication channel is for development activities, bug reports, and testing. The IRC channel is for real-time chat activities such as meetings and interactive debugging sessions.
Developers and users of GDAL participate on the GDAL mailing list. It is OK to ask questions about how to use GDAL, how to integrate GDAL into your own software, and report issues that you might have.
Visit http://github.com/OSGeo/GDAL to file issues you might be having with the software. GitHub is also where you can obtain a current development version of the software in the git revision control system. The GDAL project is eager to take contributions in all forms, and we welcome those who are willing to roll up their sleeves and start filing tickets, pushing code, generating builds, and answering questions.
You can find some GDAL developers on IRC on #gdal at Freenode. This mechanism is usually reserved for active meetings and other outreach with the community. The Mailing List and GitHub avenues are going to be more productive communication channels in most situations.
FOSS4G 2019 is the leading annual conference for free and open source geospatial software. It will include presentations related to GDAL/OGR, and some of the GDAL/OGR development community will be attending. It is the event for those interested in GDAL/OGR, other FOSS geospatial technologies and the community around them. The conference will be held in Bucharest, Romania, August 26th - August 30th, 2019.