Try this
- Put the no near the beginning so the activity organizer can make a clear plan.
- Offer a reason only if you want to. If you propose meeting afterward, make that a separate invitation with realistic timing.
A worked example
“I’m going to pass on karaoke, but I hope you enjoy it.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
You do not need to offer a replacement activity unless you want one.