Yes, acronyms should be capitalized in formal writing.
Yes, events should be capitalized when writing formal invitations.
Yes, events are typically capitalized in formal writing.
No. Formal writing is just that: formal writing. The text acronyms that you are speaking about may not be used by other cultures and they will change. If formal writing is used, others will understand it. What if I wrote" don't forget to pull the chain" or "the Iron curtain". You wouldn't know what I meant.
SPF stands for Sun Protection Factor and should be capitalized when used as an abbreviation or acronym in formal writing.
Only the "d" should be capitalized, as in Dr. Smith
Yes it should be capitalized.
When referring to a room with a number in a building, then room is to be capitalized. Room 223. This goes for a suite, Suite 224. Always capitalize when writing a formal address.
Yes, in formal writing, "Dear Brothers and Sisters" should be capitalized because it is a salutation. However, in casual writing, it is acceptable to write "dear brothers and sisters" in lowercase.
Yes, "Director of Nursing" should be capitalized when used as a formal job title.
Yes, "Certified Reading Specialist" should be capitalized because it is a formal title.
Yes, "Registered Dietitian" should be capitalized because it is a formal title.
When the term refers to a specific individual - "Patrol Officer Smith" - or a payroll title.