Crossword puzzle clue "s ance occurrence"

Rare occurrence at the U.S. Open on Father's Day that's a common occurrence at the U.S. Open on Labor Day

Letters denoting clairvoy-ance

Assist(ance)

"(That's it,) p(al, you've lo)s(t) y(our) ch(ance to watch anything tonight)!"

Party to a séance

(Slaps)ti(ck s)t(ar,) "Par(ade" ac)t(or, a)n(d Oscar nomin)e(e of F)r(ance)

Relative of -ance

Séance doings