[RBS] Mechiras chometz later in the evening

[Yitzchok & Hasha Lavi]

I need to take care of mechiras chometz but I doubt I will make it at 
the times possible in my shul. Which (if any) Rabbanim have hours for 
mechiras chometz later in the evening hours in the next few days? (or 
alternatively early in the morning)

Thank you
Yitzchok