When we shifted to the web, there was a permanent Experience multiplier on for something like "all of July and August" of 1997. (Sadly, I missed out on two weeks of that because I was hiking Philmont. Phooie.) I think basic got a 1.5x, and Premium got a 2x. It may have been 2x & 3x, but you get the idea.
My suggestion for HSN 2017: do the same again! And since we now have so many tiers of subscription, it even works out just right:
Account | Multiplier |
| |
F2P | 1.5x |
Standard | 2x |
Premium | 3x |
Plat | 4x |
And, again, run it for "all of July and August".
We should probably disable the weekly Gift of Lumnis during those two months, though.