Slidable door and sidewall associated with tents, awnings, and other protective enclosures

A collapsible protective enclosure for protecting an interior space from one or more natural elements, wherein the collapsible protective enclosure includes a frame structure that defines the interior space, wherein the interior space further defines a floor, a plurality of walls, and a roof, wherein the roof and plurality of walls intersect at a plurality of edges, and wherein the frame structure includes a cross-member spanning across at least one of the walls and adjacent to at least one of the plurality of edges, comprising:

• a slide track;
• a flexible door or sidewall;
• and
• a plurality of hooks having adjustable straps,
• wherein each of the plurality of hooks has a hooked end adapted to detachably attach to the cross-member, and a flat end having at least two slits adapted to adjustably engage a strap, the strap being connected to a rod, and wherein the flexible door or sidewall comprises a flexible sheet having a continuous perimeter that defines a plurality of discrete door or sidewall edges, at least one of the edges having a welt, and wherein the slide track has at least first and second grooves, the first groove being adapted to slidably engage the welt and the second groove being adapted to engage the rod.