Everything that tugs at my heart strings may find a place here... Perhaps that will echo in yours too..
followers of shivaism had guru sukhracharya as their brahmin adviser. Shkruvar or the day of shukracharya is most important for all shiva followers. Naturally, all islamic people must treat this day as the most sacred & observe all religious practices this day as a rule. Hence friday is sacred to muslims - Shukruvar is the name of friday under sanskrit language.