On Fridays in the summer, many shuls have mincha at a fixed time followed immediately by Kabbalas Shabbos. Sometimes you end up with both mincha and maariv in the same “time zone” (to use Geordie’s nomenclature). I know one shul that does this every day (not just Friday).
I once needed to daven an early mincha when I was traveling. A little research revealed that a certain nursing home had a mincha that I could make. Much to my surprise, it was immediately followed by maariv even though it was long before plag. I was told that it was too difficult for many of the residents to make it to the shul later for maariv.