How to contact another PI as a PhD student wishing to discuss their research? I'm halfway through my PhD and will be visiting another country for a conference. While I am there I would like to talk with some of the local researchers and hopefully visit their labs and discuss their research. I intend to email some of the researchers in my field in advance and ask if they would be happy to have a chat about their research and possibly visit their lab (briefly on the visit, more like a lab tour than anything else). 

What is the best way to ask these PI's (via email) if I could meet with them while I am in town to visit their labs and discuss their research?
Essentially, the best way to ask is to phrase things exactly as you have.

“Dear Professor $Name,

My name is Anon, and I’m an Nth year PhD student studying at University of Science. I’ll be in Wakanda for a conference from Date1 to Date2, and I was hoping to use the opportunity to meet with some local researchers whose work I have been following.

I was wondering if you might have time during that period to sit down for a chat about research, or perhaps have me visit your lab? I understand schedules can often be quite busy, so I’m happy to be as flexible as possible given the conference schedule.

Regards,
Anon”