HK's advice is sound, but they could still insist on having the meeting at the scheduled time, and ignore your requests for an agenda. In that case, I'd still go to the meeting, but I'd treat it as a discovery meeting, in which no decisions should be made (unless they're obvious and everyone is more or less in accord). It would be their opportunity to share their concerns, whatever they may be. I'd take note of everything they say, and then verify their claims later, and discuss with the whole family, before making any changes.

The only decisions to be made at the meeting are:

- What further information should I request from the school?
- When should we meet for follow-up?