Here is an interesting conference that seems similar to OSCAL
Dates: 18 - 19 April 2019
location: FER, Zagreb, Croatia
DORS/CLUC - Dani otvorenih računarskih sustava / Croatian Linux Users’ Conference - is the oldest and biggest regional conference that covers free and open source software, open standards, and the Linux operating system. For the last 26 years, DORS/CLUC has brought together many prominent individuals and companies from the free and open source software community.
The conference is coordinated by HrOpen and HULK, two non-profit organizations that tirelessly work to promote open technologies and encourage their application in everyday life.
This year conference will take place from April 18 to 19 at the Faculty of Electrical Engineering and Computing in Zagreb, Croatia. Once again, an interesting crowd will gather to attend talks about awesome free software topics.
During the three days of talks, workshops, and fun, DORS/CLUC becomes a place where students, FOSS enthusiasts, tinkerers, developers, hackers, freelancers, companies and the public sector representatives meet to learn, network, do business and plan projects together - all with focus on free software and Linux.
If you are interested to be there and are in need of some help for your application (for travel financial support or as a speaker) don’t hesitate to ping Open Labs members or member of the list.