I know we can reduce adjective clause to adjective phrase. We are able to make appositives when it is possible. Although I have learnt some materials about it, I haven't seen examples with "where" and "when" yet. I mean, is it possible to find appositives or adjective phrases with "where" or "when"? As far as I suppose, adjective clauses with them are some kind of "special" clauses.
where, when and why can be used as relative adverbs that are used to replace a preposition + which when making a relative clause, for example
Last week I visited the town in which I grew up
Last week I visited the town where I grew up