Unfortunately this suggestion is listed on the frequently asked and denied. Here is the quote from Amber.

[Quote]We're not going to make an alert for the Bathhouse because we want you guys to be able to keep up with it yourself because you can get things like cash shop credits or referral points for free. Like jim pointed out, there is the user run group that helps everyone work together and remember to visit. My suggestion is to join that or time it with something at midnight, like when you go to do quests or something.[/quote]

Since it has an official answer I will be locking this up.