GA pilot reported reduced tower services at a class D airport due to covid-19 has resulted in an uns...

Narrative:

ZZZ class D airspace has been operating on reduced hours since covid-19 started. The airspace in the traffic pattern reverts to class east once the tower is closed and pilots make announcements on the CTAF.the traffic pattern was very busy at dusk as I was arriving back from ZZZ1. I was entering the pattern by flying over the field at 2;200 and then executing a teardrop entry into a 45 for left traffic runway xx. There was aircraft Y on left downwind for runway xx as aircraft Z approached directly from the east (in opposite traffic); at pattern altitude in what it described as a 'wide entry' to join the 45 for left downwind. This entry was not wide as aircraft Y reported that aircraft Z had almost collided with it in the traffic pattern and reprimanded the pilot for his choice of pattern entry procedure. I was forced to abort my tear drop entry as aircraft Z proceeded directly for my location. I executed a 360 degree holding turn and observed aircraft Z pass approximately 800 feet below me. I sequenced in behind aircraft Z and maintained visual contact. I extended my left downwind slightly for spacing when I observed aircraft a transiting the airspace; NORDO; at 2;300 feet - this was the altitude I was previously at and the altitude which I had crossed midfield. While this aircraft didn't have to make any announcements; it is reckless to transit a busy airport; slightly above its traffic pattern; while NORDO. Immediately afterwards; while I was turning left base for runway xx; an aircraft announced that it was entering 'right traffic' for runway xx. While we are used to flying right traffic when the tower is open; this is not the prescribed procedure while on CTAF and can create a very dangerous situation. Aircraft B on the RNAV xx approach was forced to go missed given the situation in the traffic pattern.this temporary reduction in class D services has created hazards for pilots flying in this busy airspace; as traffic has picked up again to levels that warrant full-time class D service hours. This entire situation could have been avoided had ZZZ's control tower been in normal; pre-covid; operational hours.

Original NASA ASRS Text

Title: GA pilot reported reduced Tower services at a Class D airport due to COVID-19 has resulted in an unsafe environment and described several conflicts occurring while the Tower was closed.

Narrative: ZZZ Class D Airspace has been operating on reduced hours since COVID-19 started. The airspace in the traffic pattern reverts to Class E once the Tower is closed and pilots make announcements on the CTAF.The traffic pattern was very busy at dusk as I was arriving back from ZZZ1. I was entering the pattern by flying over the field at 2;200 and then executing a teardrop entry into a 45 for left traffic Runway XX. There was Aircraft Y on Left Downwind for Runway XX as Aircraft Z approached directly from the east (in opposite traffic); at pattern altitude in what it described as a 'wide entry' to join the 45 for left downwind. This entry was not wide as Aircraft Y reported that Aircraft Z had almost collided with it in the traffic pattern and reprimanded the pilot for his choice of pattern entry procedure. I was forced to abort my tear drop entry as Aircraft Z proceeded directly for my location. I executed a 360 degree holding turn and observed Aircraft Z pass approximately 800 feet below me. I sequenced in behind Aircraft Z and maintained visual contact. I extended my left downwind slightly for spacing when I observed Aircraft A transiting the airspace; NORDO; at 2;300 feet - this was the altitude I was previously at and the altitude which I had crossed midfield. While this aircraft didn't have to make any announcements; it is reckless to transit a busy airport; slightly above its traffic pattern; while NORDO. Immediately afterwards; while I was turning left base for Runway XX; an aircraft announced that it was entering 'Right traffic' for Runway XX. While we are used to flying right traffic when the Tower is open; this is not the prescribed procedure while on CTAF and can create a very dangerous situation. Aircraft B on the RNAV XX approach was forced to go missed given the situation in the traffic pattern.This temporary reduction in Class D services has created hazards for pilots flying in this busy airspace; as traffic has picked up again to levels that warrant full-time Class D service hours. This entire situation could have been avoided had ZZZ's Control Tower been in normal; pre-COVID; operational hours.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1762318
Time
Date	202009
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	Small Aircraft Low Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Direct
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft High Wing 1 Eng Fixed Gear
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 59 Flight Crew Total 149 Flight Crew Type 47
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy
Miss Distance	Horizontal 1000 Vertical 800

GA pilot reported reduced tower services at a class D airport due to covid-19 has resulted in an unsafe environment and described several conflicts occurring while the tower was closed.