Based on the provided legal document, an appellant can potentially be barred from attending their appeal under the Societies Act if certain conditions are met. Specifically, the relevant provisions indicate that the High Court has the authority to regulate the proceedings and may impose requirements that could affect an appellant''s participation.

1. Jurisdiction and Authority: The High Court''s jurisdiction is defined under the Courts of Judicature Act, which allows it to hear appeals from decisions made by statutory bodies, including those under the Societies Act. The High Court exercises its original jurisdiction when dealing with such appeals, as indicated in the document [p_264].

2. Procedural Requirements: The document outlines that appeals from decisions of statutory bodies must follow specific procedural rules. For instance, Order 55 Rule 13 of the Rules of the High Court stipulates that appeals from decisions of any person or body of persons to the High Court must be made in a prescribed manner [p_290]. If an appellant fails to comply with these procedural requirements, they may be deemed to have abandoned their application or appeal.

3. Security for Costs: Additionally, if an appellant does not reside or carry on business in Malaysia, the registrar or the court may require them to provide security for costs related to the proceedings. Failure to provide such security could result in the appeal being treated as abandoned [p_100].

4. Discretionary Powers of the Court: The High Court has discretionary powers to regulate the practice and procedure in relation to appeals, which may include barring an appellant from attending if they do not meet the necessary requirements or conditions set forth by the court [p_302].

In summary, while an appellant generally has the right to attend their appeal, specific procedural and jurisdictional requirements must be met. Non-compliance with these requirements can lead to the appellant being barred from participating in the appeal process under the Societies Act.