Crossovers that MUST be

[Jorlem]

And Earth was affected even by smaller-scale attempt that was pacified by Lindy.

I can recall no such incident in either anime or supplementary manga.

In the second to last episode there are shots of the city experiencing an earthquake.  Once everything at the Garden is over, we see Nanoha's siblings in the dojo, who say that the earthquake appears to have passed.
If we need to prevent Precia from activating her method of getting to El Hazard without Nanoha or the TSAB being there,  the Wolkenritter could do it.  The Book of Darkness first activated around this timeframe anyway, and they are quite capable of dimension hopping on their own.  Do you think pages could be drained from Jewel Seeds?
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Stand between the Silver Crystal and the Golden Sea.
"Youngsters these days just have no appreciation for the magnificence of the legendary cucumber."  --Krityan Elder, Tales of Vesperia.