Now that I have reached the epilogue, if I put off going to the Margrave’s meeting can I just bu**er off and enjoy ‘15Century Bohemia’ forever, doing all the side quests and activity givers’ tasks thus prolonging the pleasure of this fascinating game, until further expansion DLC’s become available. I will also be interested to see what v 1.4 looks like.
After what you finish main line you can do side quest but some side quest are unfinisibled because NPC disapear. with main line.
For example I try made almost all quest before I finish main line, and after I finish main line I just explor the world and enjoy the beauty of world
there are points in the story line where the available side quests either become available or become no longer available…for instance you have to reach Question and Answers after you win the battle at Pribyslavitz in order for the Innkeeper at Talmberg Inn you make mention of a quest for the Huntsman. As you noticed I’m sure there are circles with exclamation points in them and gold stars on your map, these are people who can offer quests or offer tips to quest and they pop up after large chunks of the story…best bet is to complete them as you go, even if you have to start a new game…in my opinion anyway, that’s kind of what I’m doing now 
Thanks for coming back guys. Useful information.