What you get from the calendar:
What new IPOs are coming.
When adjusts will happen.
When delists will happen.
When halts will happen.
Links to stocks and bonds related to the above.
To find it, go to the menubar at the top of every page and select:
News & Events -> Market Calendar
To see what the multiplier is for this weekend's openers:
Select the "Next Week" link at the top of the calendar.
The multiplier should be listed under Sunday (the day when adjusts happen). If it's a long weekend, it'll be under Monday.
Other Stuff
The calendar for next week gets posted Tuesday of the current week. There's no official time, but it's typically around noon Pacific time.
Hope that helps!