More people want to arrive alone and then decide whether to meet anyone. Hostelworld matches solo travellers, Joining Tables seats strangers together, and UK event posts offer people who come alone a way in. People who go to events alone describe meeting others without that being the reason they went.
Make privacy the default, with company one easy step away. If it is optional, keep it truly optional.
If solo customers ignore these features or find them awkward, think again.