Hi Eric,
Thanks for reaching out to us with your questions. Let me help you with them.
Aggregator doesn’t seem to allow me to choose multiple categories for events.
That is right, you can only assign one category to imports.
A workaround I can think of would be creating a category ‘tango-Vancouver’ and import them with that. After import do a bulk edit and change the categories to ‘tango’ and ‘Vancouver’. I understand this requires a bit of work, but currently that is the solution I can think of.
If you would like to see the multi-category assignment to imports as a feature, then I suggest you visit our UserVoice page and make a recommendation there or vote up an existing reco.
Additionally–it seems that I can only import one months worth of events.
This is influenced by a setting under Events > Settings > Import tab > Global Import Settings section. (screenshot)
If your import source is “Other URL”, then you have a separate setting for that at the bottom of the page.
If you have further questions let me know.
Cheers,
Andras