Both of 5H and Meghan have been doing really well in Australia, especially Meghan. Will they be touring arenas on their respective tours when they come to Australia. Keep in mind they will most likely go there in the beginning of 2017, meaning they still have 1 or 2 singles under their belt.

Here are some receipts from Australia:

Meghan:

Plat:
8x All About That Bass
4x Like I'm Gonna Lose You
3x Lips Are Movin'
2x Dear Future Husband
2x Marvin Gaye
2x NO
1x Me Too
Gold: Better When I'm Dancin'

Title: 2x Platinum
Thank You: Gold

Fifth Harmony:

Worth It: 2x Platinum (140,000)
Work From Home: 3x Platinum (210,000)
All In My Head (Flex): Gold (35,000)

Meghan could but 5H shouldn't
If 7/27 bombed there with a smash like WFH then I doubt they could tour arenas

I feel like Meghan could do a huge tour there.

5H will definitely tour there. They didn't just go to Australia to promote AIMH.

5H is touring arenas in the UK. I think they'll do the same in AUS.
Meghan can easily sell out arenas there. She is maybe the biggest pop girl down under.