At which stage legality check is conducted?
Ukraine
Law of Ukraine on all-Ukrainian and Local Referendums
http://www.legislationline.org/documents/action/popup/id/7114
Article17.
[…]
If the submitted documents meet the requirements of this Law, the Chairperson of the appropriate local Council of peoples' deputies, within 10 days term, shall submit the all-Ukrainian referendum initiative group documents to the Central Commission on all-Ukrainian referendum or shall register the local referendum initiative group. After that, he or she, within three days term, shall give the local referendum initiative group the required registration certificate and the accreditation of initiative group members, on a form established by the Presidium of the Verkhovna Rada of Ukraine.