Possible Duplicate: Why only on the first Saturday night of Selichot is the minhag to start at midnight? Where does the minhag come from to say the first selichos on motzai shabbas when one ...
Pretty self explanatory. Some say at chatzot all week and some in the morning. Why davka on the first night does everyone say at night? This minhag does not seem apply on the second Saturday night ...