The interview days are set (i.e UTSW only interviews on Sat.) but, some will let you reshedule (UTSW lets you change your date online and I moved my A&M interview). Others say take it or leave it (I think UTMB and Houston). Tech will let you pick your date from 2 or 3 choices and you can interview with them in El Paso on Fridays. FYI: Baylor interviews on Friday and AMCAS schools seemed to me much more lax about rescheduling. Good-luck