"召开干部会议" can be translated into English as "hold a cadre meeting" or "convene a干部（cadre） meeting".
Here are some example sentences for context:
1、 We will hold a cadre meeting next week to discuss the upcoming project.
（我们下周将召开干部会议，讨论即将开展的项目。）
2、 The leadership decided to convene a cadre meeting to address the recent issues.
（领导层决定召开干部会议，以解决近期出现的问题。）
In these examples, "hold" and "convene" are both appropriate verbs to use with "cadre meeting," depending on the context and desired nuance. "Cadre" refers specifically to a group of trained or experienced personnel, often used in organizational or political contexts.