Try this
- Identify what participation requires from you and what, if anything, it changes for existing agreements.
- Invite the other person only if you want to, and make independent participation a complete option.
A worked example
“I’m trying a pottery class on Wednesdays. It changes our usual dinner time, but you do not need to join the class.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Do not treat lack of interest in the hobby as lack of support. Discuss the specific scheduling impact and keep enthusiasm for the activity voluntary.