pixel_player376259257 and thanks @Tigger1987 for seeking some futher opinion.
Not sure I fully understand why there is a strong desire to complete the event achievements, if this is what is being suggested. The rewards for reaching the achievements is very frugal, in fact I say of virtually no interest. Even for the kudos, it is a mute debate as from what I see, they expire at events end. However, the benefit to gain higher multipliers at these destinations is (imho) the compelling reason to visit them. At the beginning of any new event, these destinations are reset and they are always my highest priority task to get them maxed out. The sooner you do, the quicker you amplify the rewards and the returns in many parts of the game. To try and max them with a few days to go on the event is now really too late, or as some have said, not plausible at the 100 'ish level.
This brings me to the next part of this topic. Heavily conditional on your strategy, the reason to max the event destinations is to trade the Amber, Purple Fabric and Sea Snails, as they are called during this event, for coins, fish, stone etc. Or, as provisions in the Job Board. Played well, you will need theses destinations. If you need commodities and lots of them, then you will get a better return. For example, Ships sent to get Sea Snails and then sent to Market to trade them for Coin is universally thought of as better value, by about 20% or more, over sending ships directly to Gulf for coins. The downside is it consumes more of your attention and you need to be in tune with your warehouse levels. Refer to other threads in forum about maximising your warehouse.
In summary, I cannot imagine why visiting these destinations to then dump the materials, solely to gain the event achievements, has any strategic purpose.
Now, huge caveat, I could be wrong, being only a <300 Level player, I welcome others to put forward their opinion. There may be a reason I am unaware of.
In regards to dumping warehouse goods to make room for other warehouse goods, that is another discussion which again in my opinion there are certain conditions where done in moderation there is some value. Another day !
Perhaps the best recommendation this late in the event is to try and max just 1 amber and 1 Purple Fabric, forget the others, then think of building a plan around where you believe the best "bang for buck" is. Remember the demands for everything are unrelenting.