The main thing that you should do is read and understand the attendance/conduct/withdrawal process.
With the assistance of a Student Union or Student Council representative, you should identify if you are able to appeal the action to expel you.
When I worked for a college, there were clear guidelines on the student misconduct procedures and a firm time limit for the student to appeal a decision. Have you read these policies, what is the time limit and is there anyone who can support your appeal?
You are not a student there now and Im worried that you may misunderstanding the purpose of your meeting, that you feel if you belatedly explain why your attendance is poor, you will get reinstated. Do you even know what the purpose of the meeting is and what the possible outcomes are?
Ive seen college students sleep walk into being withdrawn, not engaging in any discussions or action plans and then being surprised that they can no longer study.
After the disciplinary outcome, they then don't understand how to make an effective appeal. If they challenge it at all, its too late or they don't have any grounds for it to be overturned.
What never happened in my Faculty was any withdrawn student ever being reinstated. Also, absolutely no further support or meetings were held after withdrawal except for a formal appeal process.