In this case, there is no proper way to get "everything." Facebook uses some kind of algorithm based on the parameters of the limit and the distance and density of locations / places / events in this area.
You can try to keep a low distance and limit below 1000, but it really depends on the density, so for crowded areas you will get different results, for example, for rural areas.
You can also try to create some kind of "GEO grid" of the area of ββinterest to you and each time move the center location by 1 km.
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