ules ▁consist ▁of ▁talk ▁shows ▁and ▁soap ▁oper as , ▁although ▁one ▁network ▁– ▁CBS ▁– ▁still ▁car ries ▁game ▁shows ▁( a ▁hand ful ▁of ▁other ▁game ▁shows ▁otherwise ▁air ▁in ▁synd ic ation ); ▁local ▁new sc asts ▁may ▁air ▁at ▁m idd ay ▁times l ots . ▁Sy nd ic ated ▁talk ▁shows ▁are ▁shown ▁in ▁the ▁late ▁afternoon , ▁followed ▁by ▁additional ▁local ▁new sc asts ▁in ▁the ▁early ▁evening ▁time ▁period . ▁ABC , ▁CBS ▁and ▁N BC ▁offer ▁network ▁news ▁programs ▁each ▁evening , ▁generally ▁air ing ▁at ▁ 6 : 3 0 ▁or ▁ 7 : 0 0   p . m . ▁in ▁the ▁Eastern ▁Time ▁Zone ▁( 5 : 3 0 ▁or ▁ 6 : 0 0   p . m . ▁in ▁other ▁areas ), ▁however ▁these ▁are ▁sometimes ▁subject ▁to ▁pre - em ption ▁on ▁week ends ▁and ▁select ▁hol id ays ▁due ▁to ▁sports ▁programming ▁that ▁over laps ▁into ▁the ▁time ▁slot , ▁either ▁because ▁the ▁event ▁is ▁scheduled ▁to ▁occur ▁later ▁in ▁the ▁day ▁or ▁extends ▁beyond ▁the ▁set ▁time ▁block ▁( due ▁to ▁reg ulations ▁im posed ▁by ▁sports ▁le agues , ▁particularly ▁as ▁a ▁result ▁of ▁the ▁inf am ous ▁ 1 9 6 8 ▁" He idi ▁Bowl " ▁tele cast ▁in ▁which ▁N BC ▁interrupted ▁a ▁National ▁Football ▁League ▁( N FL ) ▁game ▁between ▁the ▁New ▁York ▁J ets ▁and ▁the ▁Oak land ▁Ra iders ▁to ▁air ▁a ▁made - for - tele vision ▁film