How do I invite them without triggering their PDA?

I recently got acquainted with a person who experiences PDA. I want to invite them to a meetup that I’ll be going to. However, I do not experience PDA myself and I do not know them well enough yet to know how theirs works.

What are some dos and don’ts that I can keep in mind while inviting them so I can lower the chance of triggering a demand and let them decide freely whether they want to come?