When I summon a war party, do lords go to that location or directly to me?
Solution 1:
If you're marshal and summon your forces, they will always attempt to come directly to you unless you've spoken to the lords indiviually to give them different orders. There are other scenarios where lords won't come directly to you, but these can be vaguely summarised as prioritising 'household business' over 'realm business' (for instance, they may be low on troops). Lords may also fail to attend if they're feasting, but usually the marshall's call will end active feasts.