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ATLANTA-- You've been warned: the perfect storm of traffic congestion is brewing in Atlanta this coming Labor Day weekend.

Those trying to travel out of town for the holiday will run into a lot of extra drivers on the road. Conservative crowd estimates place an extra half a million people in the area for several different events.

The Atlanta Convention and Visitors Bureau said those tourists will have an impact in excess of $70 million on the local economy.

Here are the numbers:

• Two football games at the Dome will draw 144,000 fans.
• Four home Braves games will draw about 140,000 fans.
• The Dragon Con sci-fi convention is expecting record attendance at 50,000.
• 104.7 The Fish's Celebrate Freedom Concertexpects up to 60,000 attendees.
• The Decatur Book Festival and Black Gay Pride events are each planning for crowds of 70,000 people.
• The Atlanta Motor Speedway in Hampton is expecting 100,000 people at events throughout the weekend, including a Sunday night race.

A traffic consultant told the Atlanta Business Chronicle Atlanta's congestion will be the 9th worst in the nation this weekend. So if you need to travel through town, and can't avoid the city's traffic, there are a few safe windows.

Try to leave after lunch on Friday to avoid the evening rush hour crowds. Friday night at 7:30, a Braves game and college football game will start at the same time. You'll have to wait until after dark to avoid the major congestion.

If you want to wait until Saturday to leave, go as early as possible in the morning. Traffic will pick up again at noon, with more sports events Saturday afternoon and evening.

11Alive will be covering the events all Labor Day weekend long, and providing you the latest information on travel.

If you are attending any events we'd love to see your pictures. Send them to us at photos@11alive.com.

Here are some of the big events and resources to help plan your weekend.

Dragoncon
It's one of the biggest Sci-Fi events in the country.11Alive will be covering the events on our Downtown Where You Live website.
For more information on the Dragoncon events click here.

Atlanta Black Pride Weekend
http://www.atlantaprideweekend.com/index.html

Braves
http://atlanta.braves.mlb.com/index.jsp?c_id=atl&sv=1

Chick-fil-A college football kick-off games
http://www.chick-fil-akickoffgame.com/

Celebrate Freedom Concert
http://www.celebratefreedomatlanta.com/
Theregion's largest free one-day concert takes place at Marietta's Jim Miller Park Saturday. For more Marietta news, visit our Where You Live Marietta Community Site.

UGA first home game
http://www.georgiadogs.com/sports/m-footbl/geo-m-footbl-body.html

NASCAR at Atlanta Motor Speedway
http://www.atlantamotorspeedway.com/

Decatur Book Festivalhttp://www.decaturbookfestival.com/2012/schedule/index.php
See more Decatur news on 11Alive's Where You Live Decatur Community Site.

RELATED |Latest traffic information

EVENT CALENDAR |This weekend's other events

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