The fight in Wake County, N.C., over converting some schools to a year-round calendar is far from over. Parents, who have had the ear of some county commissioners in the past, are still lobbying hard to block the conversion of 22 schools to a year-round schedule in July, including the possibility of a court battle before the argument is resolved. School officials say the extended calendar would enable them to accommodate 3,500 additional students. Parents have persuaded county commissioners to delay payment to the school district of $4.7 million for the conversions.