From Deutsche Bank via ZeroHedge, I examined the euro calendar through the end of September.
My guess is that the €30bn partial bank bailout will be used by the banks to purchase Spanish debt in addition to shoring their own capital. This should be enough to get Spain through to September.
I do not see the German Constitutional Court striking down the ESM, but the Spanish and Italians have to roll over a lot of debt towards the end of September.
The biggest problem I see is not on the calendar. The finances of the Spanish and Italian regions are rapidly deteriorating, and they will not be able to keep a lid on those problems forever.