Well, I have to do my 90 day report and tomorrow is as good a time as any, does anyone know if Immigration in Bangkok is open tomorrow? I noticed that many businesses were closed today and I know that Thai government offices will take any opportunity to get a few days off.

I as well have my 90d report due tomorrow

What I would like to know also is that will my classes be canceled at a private Bangkok Uni..

Nothing should be closed tomorrow except private business owners. It is not a public holiday.