Which scrum meeting is suitable to perform technical analysis/architecture design on a story? Which scrum meeting is suitable to perform technical analysis/architecture design on a story?

**There are no special events for that kind of activities.**

Technical analysis or architecture design may be a part of backlog refinement or story implementation itself (or both).

However, despite the fact that the Scrum Guide does not describe any special events, there are no obstacles to hold a special meeting for these purposes. Scrum is a framework and it can be configured flexibly. Everything which is not forbidden is allowed ;-)