All conditions of employment relating to legal holidays, including decisions such as the closing or opening of schools and compensation for work performed on a holiday, shall be proper matters for collective bargaining pursuant to chapter 57 of this title. (Amended 1975, No. 48, § 9, eff. April 15, 1975; 1985, No. 251 (Adj. Sess.), § 2; 2013, No. 92 (Adj. Sess.), § 114, eff. Feb. 14, 2014.)