I'm only gonna talk about clue scrolls.
While clue scrolls themselves aren't a very bad idea, the chances of them becoming dead content are quite high, there are various reasons for this. First off, many of our players are not familiar with RS, and thus don't know of clue scrolls, if they got one, they wouldn't know what it is nor what to do with it. Rewards are also an issue, most of the original clue rewards are already in another place, if there aren't many rewards players would want from clues then nobody is gonna even bother doing them. If there are decent rewards for the clues, those will end up stacking up due to the lack of item sinks and clues won't be worth your time because the items aren't worth much. They will take up a lot of development time, we'd need to make sure they won't become dead content before development even starts.
Sorry, but I disagree with adding clue scrolls.
I am all for more events though. Evil tree could be a farming/woodcutting/firemaking event, I think this has already been suggested. We could also branch out on what we currently have. Shooting star could use some more rewards. And lastly, if you have ideas for what you're suggesting, please put them in your post in order to convince people. It makes a big difference.