Cross-post; my
bold:
CZ-5 schedule after Y3 from the Liuyi twitter:
2019.11 through 2020.02 TBD -- [CZ-5 №Y3 with Shijian-20: Information posted by PM3; was cropped out of image in original tweet]
2020.04 -- [MDR/WDR of the CZ-5B at the launch pad: Correction by GP SST]
2020.07.23 through 08.05 -- CZ-5 №Y4 with HX-1 (Mars-1) mission
2020.10 -- CZ-5B №Y1 with Chinese Next Gen spacecraft
2020.12.04 through 8 -- CZ-5 №Y5 with CE-5
2021.Q2 -- CZ-5B №Y2 with Tianhe base blok of Tiangong space station
There is another date at the top of the tweet which got cropped:
长征五号遥三火箭,实践二十号通信卫星
2019.11-2020.2 ( 待定 )
This is Shijian-20, Nov 2019 - Feb 2020 TBD.
EDIT 7/24; see my cross-post down-thread.
CZ-5 RTF July 2019
<snip>
This contradicts everything mentioned and rumored in the last few months but it's an official upload by official Chinese media.

YT link is dated July 15, but apparently someone didn't "get the memo"...
The on-screen text also claims that
Chang'e-5 will launch in November 2019.
Cross-post. Are these ships fetching the return-to-flight CZ-5?
China's rocket-carrying ships depart for transportation mission
NANJING, Oct. 12 (Xinhua) -- China's two rocket-carrying ships departed Saturday from a port in east China's Jiangsu Province on a transportation mission.
The two Yuanwang ships are China's first ships made exclusively to carry rockets. With a length of 130 meters, a width of 19 meters and a height of 37 meters, the ships have a displacement of 9,000 tonnes.
Each ship is equipped with two 120-tonne cranes that can hoist large rockets. The ship is also installed with a marine environment protection system and anti-vibration equipment.
The two ships have conducted missions including the maritime transport of the Long March-7 and the Long March-5 carrier rockets. Each ship has sailed more than 40,000 nautical miles and has successfully completed more than 10 maritime transport missions.
Source: Xinhua| 2019-10-12 21:40:08|Editor: ZX
http://www.xinhuanet.com/english/2019-10/12/c_138466946.htm
Cross-post. Are these ships fetching the return-to-flight CZ-5?
That sounds like the most likely payload. CZ-7 is not expected to fly again until next year.
Cross-post. Are these ships fetching the return-to-flight CZ-5?
That sounds like the most likely payload. CZ-7 is not expected to fly again until next year.
The ships will also be used for transport to WSLC of the CZ-6 and the CZ-8 sub-families.
This reporters' pass for the CZ-5 RTF is effective in Wenchang for the period of 15-31 December 2019, so previous reports seems to be correct!
BTW For those who are waiting for constant updates for this one....you may leave now. 
https://twitter.com/Cosmic_Penguin/status/1189722321801510918
The launch pad in view for a city over half a million people. I would expect to see streams from amateur for the launch itself, just like all other launches from Wenchang what happens after the rocket left camera view would have to wait for official news though.