well "may" is a verb and "well" is an adverb equivalent of good. so "may well" is a bit like saying "there is a good chance that I may" except that it isn't likely. In a legal/technical context the 3 levels of commitment are "may" allowed/optional to do "should" prefered to do but not required "shall" have/required to do

There are various types of seminars but typically they are a gathering of people to exchange ideas on a topic/area of interest. They typically have lectures and workshops. A workshop is technically something very different. You actually get them at seminars. A workshop is a group of people who come together to work together. All participants are normally active and taking part in the activity i.e. it is a gathering to get work done. so for example a lecture is typically 1 person talking to many. one type of workshop is a teacher/instructor who supervises/helps as all member try to work through something. There are other types of workshops though as well.

Not sure if I'd say it was the best but it has stuck with me. Stranger in a strange land by Robert A. Heinlein.

From what I can see this is actually incorrect on purpose, as a exercise to be corrected. [What] has traditionally [been held] as [prooving] and irrefutable can [no longer] be considered so. Note prooving is an obsolete/incorrect spelling of proving. I'm not sure what rules are meant to be followed when fixing it, the following should be ok. What has traditionally been held as proven and irrefutable can no longer be considered so. What has traditionally been held as proved and irrefutable can no longer be considered so. What has traditionally been held as proof and irrefutable can no longer be considered so.

What is the "Night Wolves"? (The club) Who is the owner/proprietor of this club? What was the original name of this club " The Surgeon" or "Night Wolf"? The club is famous not only in Russia but all over the world, isn't it?

grace is a pretty complex concept. for example "to show grace to" is similar to "to be kind to". graceful is to move and act with grace. i.e. to move fluidly and dignified. so grace is the action of grace. gracefulness is the being the embodiment of somebody who exhibs grace. He moves with a lot of grace. He moves gracefully. He is the embodiment of gracefulness.

It means It's not something you were planning/intending to do. This can have a lot of subtext depending on context.

Vegas is a city in Nevada in the USA. It is very well know for gambling, casinos, and other stuff.