I was hoping to avoid 'world shaking event' type periods. What is the Closing? Would it be possible to have a 'mercenaries out for hire/bodyguard/assassin/loot the ruins' sort of game without Significant Historical Events to worry about, and having to work same into the game? Say about a 250-300 year period? I was hoping around 750-1000 would serve as such. Please bear in mind that I quit keeping up with Glorantha's meta-history around 1985, so right now am very ignorant about it. And sources are hard to find and/or too expensive. So I was hoping folks around here could fill me in.
There is no problem at all with a mercenary band moving along from disaster to disaster. You should leave Jrustela as soon as the Closing reaches its northwestern shores (or you get stuck). If you flee via Pamaltela, you can travel around the east to Genertela, and have uninterrupted, Black Company style "fun" until the Rise of the Red Moon or longer.
The world is not ending. Bits and pieces get mauled or shut off, but so what?
So, unless you prefer being stuck in Pamaltela or the East Isles, you ought to leave Jrustela by 930, and get to Kralorela before 954. Avoid Seshnela, Slontos and western Ralios in 1049-1050 and Dragon Pass in 1100-1120, and when in Kralorela keep to the uplands, and your company will be fine.