Thanks for your question.

These are a type of June Bug. More specifically they are known as a Summer Chafer or European Chafer (Amphimallon malale). As you observed they are very frequent at night, especially at this time of the yea.r They are a relatively new species in Minnesota that were first reported only a few years back. Just vacuum them up when you see them. They will soon disappear. See the following for more information:

https://extension.umn.edu/yard-and-garden-news/another-invasive-insect-confirmed-minnesota

https://www.mnla.biz/blogpost/1138804/354705/European-Chafer-Beetle-a-Serious-Turf-Pest-Documented-for-the-First-Time-in-Minnesota

https://bugguide.net/node/view/1065617

https://www.google.com/search?q=Summer+chafer,+minnesota&oq=Summer+chafer,+minnesota&aqs=chrome..69i57j33i160.6999j1j7&sourceid=chrome&ie=UTF-8

https://www.inforum.com/news/lawn-damaging-beetle-found-for-first-time-in-minnesota

Thanks again for using our forum.

Thanks for the update.

These critters should be mating and disappear within a few weeks. In the meantime they are relatively harmless albeit a nuisance. In night when they are active their movements and typically in an upwards direction.

Thanks for your continued interest in our forum.