Summer Fun free or low cost activities

I wanted to attach some websites, of some free and low price things that I found to do this summer. Some may already be known others may not, so I figured I would spread the word:) Have a great summer!!
http://celebratestlouis.org/Celebrate/schedule.cfm

http://www.circusflora.org/home.htm

http://www.mobot.org/150/nights/default.asp

http://www.stlzoo.org/events/calendarofevents/summerzooweekends.htm

http://www.fyfstl.com/calendar.php

http://www.wehrenberg.com/presenting.aspx?pId=139

http://www.shakespearefestivalstlouis.org/CurrentSeason/PlanYourVisit/FestivalGuide/tabid/103/Default.aspx

For more adult activities I found this site.
http://stlouis.metromix.com/events