Can I perform voluntary fast as per Nabi Dawood a.s. but some weekends I can't fast as I'm visiting a brother or receiving guests at my home. I find it disrupting the intended 'alternate days' and feel guilty for fasting on a Friday alone without fasting the day before or after. Is it sinful?

Ustadh AbdulAziz al-Haqqan

You can it is not a problem as Imam Ibn Qudamah said.