@ASAP: It would probably be easier to follow the dates and information on beyondbeautifuljlo than anything else.
When you get to the website, you can select appearances on the right menu. There you will get this type of inforrmation, like her appearance at the 2011 MDA Labor Day Telethon on September 4 (this Sunday in 2 days) on FOX, so don't miss it :)
Next to her will also perform Celine DION (OMG), Martina McBride, Jimmy Webb, etc...

Now I know i won't miss it :D

*****
Get some JLOVE? @ jenniferlopezdotcom