PSA: Dragon is one of the most important objectives.
Support please ward, jungler ward, anyone ward it when its not lit up. Especially with someone who can solo it. 
Always have 3+ people to take it down and back off if is above half health and you get spotted.
Never let a team sit back and take dragons, if you cant fight them create minion waves and try pushing to inhib
Always care if you dont have smite either, losing drag even though you may have killed the guy who stole it isnt worth as much as the drag
5 Dragon buff > inhibs > baron