Can you hire a bartender during the Covid restrictions?
Yes, (as current of 22.9.20) you can still hire a bartender for a gathering in your home, provided the total number of attendees including the bartender does not exceed 6 people.
Under the current guidelines (published 22.9.20) The English Government have stated that you can still gather across different households, provided the total number does not exceed 6 people in England.
Although Scotland, Northern Ireland & even Wales have gone one step further & restricted inter household gatherings. For England it is still a total number of 6 people, regardless of however many households they come from.