By this time of year the yellow jackets have developed their nests to enormous structures and become more noticeable. There isn't much you can do other than spray the nest and mow over it quickly.
The busy bees around the shrubs could be honey bees collecting pollen. I trimmed some shrubs a week ago that were covered with honey bees. When I started trimming they went away. Didn't bother me at all, although I hated to cut down their source of pollen.
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