The following Splunk query will show a summary of all weekday activity for a given website in IIS.

sourcetype="iis" (NOT date_wday=saturday) (NOT date_wday=sunday) | stats count(JSESSIONID) as Value | eval Metric="Total Hits on Weekdays" | append  | append | append  | fieldformat Value=tostring(Value,"commas") | fields - count, percent |fields Metric, Value