So, you've been tasked with 
      (1) set up a 30 minute meeting with 11 participants on July 24th between 9am and noon  or  July 25th between 9am and 10:30am.
      (2) at a time acceptable to the majority. 

Ten (10) minutes later you report back to your boss with the "Wednesday, July 25th - 9:00 am to 9:30 am." 
Your boss thinks you are a genius.     How did you complete the task so quickly?   I say "Doodle"

DOODLE is a free online tool to help determine -  at what common time and date are multiple people available for a call or meeting? 

WHAT YOU DO:
1)  Create a poll:  You determine the dates and times to be voted on.
2)  You send an email to each participant and ask than to indicate their availability dates and times.
The email includes a hyper link that the participants must click to vote

WHAT THE PARTICIPANTS DO:
1.  get an email, click a link 
2.  check which date/time you suits 
3.  submit
that's it. and actually that's its big advantage: it's not another calendar.

The results are tallied, the winning time emerges, and you're ready to block the time on everyone's calendars. 
Doodle is free.  No sign-up is required. 
Doodle is a simple polling system that helps people coordinate times when they can all meet. 

CAUTION:
DO NOT ENTER SENSITIVE INFORMATION ON THE DOODLE SITE.
PLACE THAT INFO IN YOUR EMAIL INSTEAD.

Doodle Web Site: DOODLE