To elaborate on my suggestion;
This is going on the assumption that there will be a free shop event in the cafe on every Sunday afternoon and that there is a temporary drop of point/shelving in the corner of the action room (between the mirror and window) so that the freeshop cupboard (and corridor outside it) is kept neat and legal.
There would be a 4 week rotation of free shop items. If it's not taken in 4 weeks, it goes. Imagine 16 open-topped plastic boxes (something like the type Tesco use to put their shopping bags in for home delivery vans, circa A3 sized). 4 are Red, 4 Green, 4 Yellow and 4 Blue - one colour group for each week. The item is stored in one of the large plastic boxes, the colour of which depending on the week it comes in, with 2 boxes for clothes, one for books, one for misc hardware (kitchen, techy, etc).
(note this is a suggested number of boxes, but sounds about right)
On the Sunday, all boxes are put on the stage, along with items from the temp drop off point. People take things. At the end of the event, the box group - say Red - for that week that still has stuff left (i.e., stuff that has been waiting to be taken for a month) has its items taken out and donated to a charity shop/sent to a recycling company/thrown out. Things left from the drop off point are put into the Red boxes and those are returned to the shelves in the freeshop cupboard (along with the Green boxes that have, at that point, 'one week left', the Blue that have 'two weeks left' and Yellow that have 'three weeks left').
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