More people took a waterslide down the Lyon Street hill on Sunday, August 22, 2010

Scenes from the first day of the world's longest waterslide event in downtown Grand Rapids (August 21, 2010)

Scenes from the first day of the world's longest waterslide event in downtown Grand Rapids (August 21, 2010)

Waterslide organizer Rob Bliss cools the crowd on Lyon Street Hill (August 21, 2010)

Scenes from the first day of the world's longest waterslide event in downtown Grand Rapids (August 21, 2010)

Scenes from the first day of the world's longest waterslide event in downtown Grand Rapids (August 21, 2010)

Scenes from the first day of the world's longest waterslide event in downtown Grand Rapids (August 21, 2010)

Scenes from the first day of the world's longest waterslide event in downtown Grand Rapids (August 21, 2010)

A T-shirt from the first day of the world's longest waterslide event in downtown Grand Rapids (Aug. 21, 2010)

Scenes from the first day of the world's longest waterslide event in downtown Grand Rapids (August 21, 2010)

The waterslide on Lyon Street hill shortly before it was inflated (August 21, 2010)

Rain delayed the start of the waterslide event on Lyon Street hill (August 21, 2010)

A few people gathered to watch the installation of the 500-foot waterslide on Lyon Street hill, despite the rain (August 21, 2010)

Rai delayed the start of the waterslide on Lyon Street hill (August 21, 2010)

Grand Rapids events guru Rob Bliss' 500-foot Lyon Street Waterslide (Aug. 17, 2010, courtesy Bliss' Facebook page)

Grand Rapids events guru Rob Bliss' 500-foot Lyon Street Waterslide (Aug. 17, 2010, courtesy Bliss' Facebook page)

The waterslide that will be set up on Lyon Street this Saturday and Sunday as Rob Bliss' latest community event (Aug. 17, 2010).

The waterslide that will be set up on Lyon Street this Saturday and Sunday as Rob Bliss' latest community event (Aug. 17, 2010).

The waterslide that will be set up on Lyon Street this Saturday and Sunday as Rob Bliss' latest community event (Aug. 17, 2010).

Grand Rapids events guru Rob Bliss' 500-foot Lyon Street Waterslide (Aug. 17, 2010, courtesy Bliss' Facebook page)

A water slide from Worldwide Inflatables, Inc., which will be used for Rob Bliss' project in downtown Grand Rapids. (July 29, 2010)

An artist's rendering of Rob Bliss' waterslide project in downtown Grand Rapids. (July 29, 2010)

This is a rendering of a proposed waterslide Rob Bliss wants to put in downtown Grand Rapids for a free event in August (May 19, 2010)