The Ed Sullivan Show: Season 5

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "The Ed Sullivan Show" Season 5.
Keys: overview (160-220 words), primer (array of exactly 4 concise bullet points).
Constraint 1: Use ONLY provided SYNOPSIS and SOURCES.
Constraint 2: No invented titles, names, dates, counts, awards, ratings, box-office, viewership, or plot points.
Constraint 3: If a detail is not in the material, omit it.
Constraint 4: Original, neutral, encyclopedic prose in plain text.
Constraint 5: No markdown, no asterisks, no headings, no bullet points (within the prose, though the primer is an array).
Constraint 6: Output valid JSON only.
TMDB Synopsis: Season 5 is on the "Toast of the Town" guide.
Source [1]: American TV variety show, ran on CBS from Sunday June 20, 1948 to Sunday June 6, 1971.
Source [2]: American television variety show, ran on CBS from June 20, 1948, to March 28, 1971, hosted by Ed Sullivan (New York entertainment columnist).
Source [3]: Cast and crew credits info.
Source [4]: American TV variety show, ran on CBS from Sunday June 20, 1948 to Sunday June 6, 1971, hosted by Ed Sullivan (New York entertainment columnist).
Source [5]: Info about Anne Meara (not relevant to the season 5 overview unless she's in the synopsis, which she isn't).
Overview: The synopsis says "Season 5 is on the 'Toast of the Town' guide." There is no narrative arc described. There are no plot points. There is no description of what happens in Season 5.
Constraint Check: "Do not invent plot events or spoilers." "If a detail is not in the provided material, you omit it rather than guess."
Problem: I cannot write a 160-220 word summary of a narrative arc if no narrative arc is provided. The only information about Season 5 is that it is on the "Toast of the Town" guide.
Primer: I need 4 bullet points regarding previous lore, character positions, and stakes. The sources provide: The show is an American TV variety show, it ran on CBS, it started June