Related Clues:

• NCAA elite group
• March Madness semis
• *March Madness round with especially loud crowds
• March Madness quartet ... or, collectively, the second parts of 17-, 25-, 37- and 51-Across?
• March Madness elite group
• Round after the Elite Eight, and what the ends of 16-, 29-, 34-, and 45-Across are?