You may Open Carry literally anywhere with the exception of;
Federal buildings (post office etc.)
Properly restricted by a sign at every public entrance (no specification for size, shape, wordage of sign)
Denver City/County (en whole- no signage needed)
Further more- We will honor your Michigan concealed permit so long as you are legally still a resident of Michigan. From what I gather- you are here now but have not legally established residency. You have 30 days to establish residency in Colorado or you are still a Michigan resident. If you are ever stopped by police and you are Over your 30 days- be careful with your thoughts and words.
Whether or not there is alcohol being served and consumed has no effect on your ability to carry openly or concealed. Being intoxicated on alcohol or anything else is completely unlawful when carrying a handgun- this means not even one beer- there is no lawful "limit" on the level of intoxication.
You may carry into any government building outside of the above mentioned Federal buildings. There are a few examples to give- Castle Rock has public buildings properly posted with signs. When you get out to the mountain communities- you will most likely not find any signage but you do need to be on the look out for such at all times.
**Concealed Carry has a different set of restrictions.