Yes. You are not required to submit results for all languages /
parliaments. The results for a single parliament or a subset of
the available parliaments is perfectly acceptable.
Since this is a multilingual, multi-country data set, you are
encouraged to work on all parliaments. We also hope to see some
cross-lingual approaches. However, submissions focusing on on a
particular country, or a subset of countries is also welcome.
Best,
Cagri