My wife's school usually takes care of these matters (yes we have be spoiled) so we are a bit clueless. We are due to do our 90 day report on April 19th which is a Sunday, unfortunately the lady at the school who usually takes our passports and does the report for us is off work because of the extended Songkran break I've heard it's ok to report one day late (Monday) if the office is closed on the due date, so my question is should we go to the Immigration office ourselves today? or wait until Monday and let her take care of it?

If we do go today is there anything we need to take with us apart from our passports?

You can do 7 days either side of the report date. You need to fill in this form.

You can do 7 days either side of the report date. You need to fill in this form.

That's great, thank you