Today's narrow defeat to Yorkshire Vikings in the Royal London Cup has secured top spot in Group 2 for the Welsh county and a home semi-final.
Glamorgan will play the semi-final at Sophia Gardens on Monday, 16th August - a day earlier than originally scheduled.
Chief executive, Hugh Morris, said: “With a packed cricket calendar, we have worked closely with the ECB to bring the match forward to guarantee a home semi-final at Sophia Gardens for our members and supporters.
“We are also delighted to confirm members will be able to attend the match free of charge as a thank you from the club for their loyalty and support.
“Under David Harrison and Kiran Carlson, the team has played superbly in the competition, and we hope as many of our members and supporters will be able to cheer on the team as possible on Monday.”
Glamorgan topped Group 2 by net run rate on 10 points, with four wins, two no results and two defeats from their eight matches.
It is the first time the Welsh county have reached the knockout stages of a List A competition since 2013.
Members will need to confirm their attendance in advance and be emailed a ticket, but seating is unreserved in the Members', Castell Howell and Croeso Stands. All members will receive the usual email tonight in order to do this and entry will be free of charge.
Tickets are on sale now and available to purchase HERE.