The Ed Sullivan Show: Season 7

Season overview

Role: Meticulous television and film archivist.
Task: Create a JSON object for "The Ed Sullivan Show" Season 7.
Keys: overview (160-220 words), primer (array of exactly 4 concise bullet points).
Constraints: Use ONLY provided synopsis and sources. No invented facts. No markdown. Plain text prose. Valid JSON only.
Input:
Synopsis: Season 7 is on the "Toast of the Town" guide.
Source 1: CBS variety show, ran June 20, 1948 to June 6, 1971.
Source 2: CBS variety show, ran June 20, 1948 to March 28, 1971, hosted by Ed Sullivan.
Source 3: Cast and crew credits.
Source 4: CBS variety show, ran June 20, 1948 to June 6, 1971, hosted by Ed Sullivan.
Source 5: Info about Anne Meara (not relevant to Season 7 specifically unless linked in text, which it isn't).
Season 7 synopsis: "Season 7 is on the 'Toast of the Town' guide."
General show info: American TV variety show, hosted by Ed Sullivan, ran on CBS.
Dates: Started June 20, 1948. Ended either June 6, 1971 or March 28, 1971.
Overview: I need 160-220 words.
Wait, the synopsis is extremely sparse: "Season 7 is on the 'Toast of the Town' guide."
The sources provide general info about the show (variety show, CBS, Ed Sullivan, dates).
The prompt says: "Write ONLY verifiable facts that are explicitly supported by the provided SYNOPSIS and SOURCES."
The prompt says: "Do not invent plot events or spoilers."
If I write 160-220 words about a season where the only information is that it is on the "Toast of the Town" guide, I will run out of facts immediately.
Let's look at the facts available:
The show is an American TV variety show.
It originally ran on CBS.
It was hosted by New York entertainment columnist Ed Sullivan.
The show began on June 20, 1948.
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