Delicata is a Cucurbita pepo. This species includes zucchini, which is in so many gardens. If it wasn't in yours, it may well have been growing a hundred yards or so away and bees pay little attention to fences
Cucurbita pepo also includes some of the gourds. Seems like most of the warty types popular now, are in this species. Jack o'lantern pumpkins are also Cucurbita pepo.
The flowers in your and you neighbors' gardens are likely open and inviting the pollinators.