The Catan Tournament listings disagree with what is listed on Mayfair's website.
Per Mayfair's site there are qualifiers Th/F/Sat, quarters Saturday evening, semis and finals on Sunday.
Per GenCon events, there are qualifiers Th/F
which say winners move on to Saturday BGM1692980, BGM1692984
Round 1 (?) on Saturday Morning BGM1692986 and then Semis/ Finals on Sunday BGM1692987
No mention of Saturday evening Quarterfinals.
Maybe Mayfair changed plans and made Saturday morning the Quarterfinals?
The "Round 1" entry for Saturday morning is a little unclear - is it a quarterfinal or a qualifier?