Where can one find guidance from a teacher next year in 2018? Where on Earth or online are future retreats or classes for an insight practitioner to get Dhamma guidance and/or guidance through some version of the stages of insight meditation?

Are there teachers who might guide an insight practitioner on a one on one basis, given the right situation?
Best and proper way is to approach and ask personal, after having spend a good time next him and have observed his virtues, Nyom Lowbrown.

It's in dependency of assossiation with admirable friends, that one gaines right view. Of course the condition to meet such is a matter of upanissayapaccayena (strong condition causes) and not possible to buy and demand.

So keep always in mind: Better to Give than to Consume. Having not the right attitude and behaviour, one, like many and most, would just meet poor business in Dhamma and Juwel-thieves of many kinds.

People who are really into Dhamma have neither dates nor calenders, but always open doors for those seeing them and having the condition to enter. For those always right in front and near. Someone demand, consume... no way to meet, enter and learn, or being haunted by spirits when enter without a clean and honest mind.

[Note: This is a gift of Dhamma and not meant for commercial purpose or other low wordily gains by means of trade and exchange.]