Even some bahun if nepali origina started to celebrate chhat in Terai. Last year when I was at my parents home and one of their chimeko who is Mainali fast and celebrate chhat parba. I used to think that this is only for those people who are origin India I mean mostly teraibasi who speaks, Maithili, bhojpuri, bihari but now nepali speaking nepalis are celebrating. That is a good thing!!!!!