Is it possible to make tasker events conditional on whether I'm roaming?
If you are usually home at 7pm, you could make it conditional on the presence of your home Wifi network (using "Wifi Near") or a cell tower near you (using "Cell near"); if you use a dock at home, you could make it only fire when docked instead.

You could also make it dependent on a calendar and just set the dates for your trip now.