BTC's halvening in 2016 was in July and for this year it was in May, 2 months earlier.
Ah, so October 2020 is the new December 2017 ? That's when we dump everything to Kingdom Come and run for the hills ? (Only for the $USD to then crash & burn as that's also when hyper-inflation might be getting started). Things might get complicated.
There will likely be alts with 7-10x gains in a matter of days come January if not a bit earlier.
As I remember, most of the alts reached their peaks inside the BTC/USD bubble. OMG, PPT, BAY, even NxT. But they were spiking through out the year also - BTS went berserk around October I think. Dash was months before.