Even though these meetings won't be listed here on the first page, you might be interested.
April is supposed to be the decisive months for German swimmers. There are four meetings in April, which are FINA approved qualification meetings. And after these four meetings, the German swimming team will be completed. Or at least this is the plan.
The four meetings are:
Würzburg, April 3rd - 4th
Magdeburg, April 9th - 11th
Berlin, April 16 - 18th
Dortmund, April 17th - 18th
Source (in german), including a list of the entry timed german swimmers are supposed to be swim and the already qualified athletes: Quali-Finale in Berliner Bubble | So kommen die DSV-Asse zu Olympia - SWIM.DE