The first clue, "Birthday", opens the board with intentional ambiguity. In Pinpoint, a single clue rarely proves the category — it is a starting hypothesis, not a verdict.
"Christmas" narrows the field. A valid category must explain both "Birthday" and "Christmas" with the same rule — not two separate stories.
By "Wedding", the category "Types of "party"" should start to feel inevitable. Three clues with one rule beats three clues with three excuses.
"Baby" adds another member of the same set. Each new row should strengthen "Types of "party"", not send you hunting for a new theme.
"Housewarming" is the stress test. If "Types of "party"" still fits naturally here, the puzzle is solved; if not, your category is too narrow or too broad.
Read together, "Birthday", "Christmas", "Wedding", "Baby", and "Housewarming" converge on "Types of "party"". That convergence — one precise category, five varied clues — is the structure Pinpoint rewards.