I got two different copies of MT&R's newsletter with the following details on this event -- the latter appears to be updated w/ schedule info:
Family Event
Fifty Years of Fabulous:
Celebrating The Jim Henson Company's 50th Anniversary
Saturday, September 24, 2005
12:00 to 4:00 p.m.
Join us for an afternoon of screenings, activities, and special guests from the Henson Company as we celebrate their fifty-year achievement.
Tickets: There is a $5 admission charge for this event. Tickets will go on sale September 7 and may be purchased in the Museum lobby during regular Museum hours or by calling the Museum at (310) 786-1091 between noon and 5:00 p.m.
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Family Event
Fifty Years of Fabulous:
Celebrating The Jim Henson Company's 50th Anniversary
Saturday, September 24, 2005
12:00 to 4:00 p.m.
Join us for an afternoon of screenings, activities, and special guests from the Henson Company as we celebrate their fifty-year achievement.
12:15 p.m. Sneak preview of the new television series, Frances, and drop-in puppet-making workshop
12:30 p.m. Book signing with Cheryl Henson, It's Not Easy Being Green and Other Things to Consider
2:00 p.m. Puppeteer demonstration
3:00 p.m. Fraggle Rock screenings
Tickets: Included with Museum admission and available on a first-come, first-served basis.
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As far as I can tell, this is indeed at the LA location only (since the number given is for the LA museum), although it's possible they could be hosting a similar event at their NYC location since it has happened on a few occasions. I can't find any such details on the website though:
http://www.mtr.org/