One thing to add to your list . . .
Put people together who have the same rulesets for play. It makes things SO much easier.
Just a quick note - I sincerely doubt that you will get too many to agree to the CV19 test. And no, I am not anti-face mask tinfoil person.
We put on parties at hotels a LOT. We have been doing this for the last 7 years. Here is what we do.
- We tend to know everyone that is attending. On occasion, someone we know will want to invite someone they know. No one ever gets in unvetted.
- We put playstyles together. Some people want the same bed only. Some people are ok with their spouse going to a room 12' away and having fun. Some people are condom only, some people are no condom, some are go with the flow. When you mix the no and the only's you run into issues.
- We tend to put age groups together. Having a group of 20 and 30 somethings and then someone who is 65 shows up, not a good mix.
- We tell EVERYONE beforehand what type of party it is. This could either be a 500-word description or a 10-minute discussion. NO one ever goes into any party that we have put on not knowing the playstyles and how things flow.
- We only do BYOB and bring some food that you want to eat/share. The veggie plates tend to get 1/4 eaten and before any play starts. The person who said that the meats, cheese, chips and sweets go - YUP! We see that a LOT.
- Be an asshole. I know that sounds odd. We have found that some people will wind up thinking that your party is a club. We tell people that the party starts at 7. Be there around then and there are no issues. If traffic happens, let us know. However, at 8, the door is locked and we ain't answering it. We also tell people that when we invite, we are looking for an exact number. That can range from 4 to 7 other couples and 1 or 2 SMs. If we invite you, let us know that you can make it or not. If you say yes you can make it and then decide at the last minute that you can't, we will never invite you again. This shows respect to all the other attendees. If you are looking for the bigger better deal, not a good fit. In our 7 years of this, we have had people text pictures of the car accident they got in along the way. We had one couple text us a picture of them in the hospital, the woman wanted something from the drug store and slipped and fell and broke her ankle. Those were valid reasons to not show up. Because of me being harsh, we have had two couples who were not good fits, one person didn't think we were serious about not answering the door and tried to show up at 9:30, and one person who did try the bigger better deal. Everyone loves the parties and we are still getting texts asking when they will start up again.
In the end, it's your party, your rules. Establish them and let them be known. People don't do well with surprises. By letting them know early, they can easily opt out.
Good luck and have fun.