Hello all,
Lydia and I, as moderators of this list, are filtering the announcements about conferences, keeping only the ones that have a link to Wikidata or could interest the broad community. The criteria of having to pay for the conference or not is not taken in account.
In that case, the conference includes open data in its topic, and some members of the Wikicite group have been there in the past, that's why we thought it would be interesting for the Wikidata community.
However, we don't tolerate spam, multiple-reminders for the same event, and we try to reduce the noise as much as possible for the ~1200 subscribers of this mailing-list.
Thanks for your understanding,
Léa