Lots of other trials and research on that site. Start here and bounce around:

https://www.nia.nih.gov/alzheimers/clinical-tri...*

Also recruiting in-home caregivers of spouses in this study:
https://www.nia.nih.gov/alzheimers/clinical-tri...

Says they are still recruiting, but it also put an end date of August 2019, so I'm not too sure about this. But might be worth a look.

Also lead by a group in California. So I don't know if it requires trips to CA.

I also found this -- they are recruiting healthy volunteers and those with mild cognitive impairment for an Alzheimer's Prevention Trial Web Study. Seems simple to participate because it's all via the web.

https://www.nia.nih.gov/alzheimers/clinical-tri...

I ran across these two so far:

Rochester, MN: seems like a simple blood test https://www.mayo.edu/research/clinical-trials/s...

Rochester or Jacksonville, FL: study of ages 40-64 with early onset demention https://www.mayo.edu/research/clinical-trials/c...