Choose small number of official resources
Japan Sumo Association provide Japanese illustrated guide to basic movements, official mawashi guide and catalogue of winning techniques. Their English introduction to sumo exercises give another starting point for discussing basic movements. These resources help visiting club agree vocabulary before meeting instructor. Na references for preparation, no be evidence say every movement or technique go dey taught for particular private programme.
Use di rules for di competition wey you dey study
If di visit relate to international amateur competition, use International Sumo Federation regulations index to find di relevant official documents. Professional sumo material and amateur competition rules serve different purposes. Check di document and version wey match your question instead of mixing rules from memory. If one point still no clear, carry am to di right governing body or raise am as specific discussion question instead of presenting your interpretation as settled fact.
Come with questions wey get clear focus
Choose a few pages or terms wey directly relate to your goals and note wetin you want make dem clarify. Share specialist language needs with organiser so una fit discuss proposed interpretation. Ask permission before you record demonstrations or reuse teaching material, and keep source links inside your notes. After di visit, return to di same references to separate wetin official material say from wetin you observe for one session. That separation make club debrief clearer and more useful.