The answer is a resounding YES!!
On three consecutive days I was serving refreshments in a beautiful church, literally in the middle of Salisbury Plain. The first day saw over 700 signatures in the visitors book. The church has limited opening and shares an amazing history with the abandoned village it's in. No heating, no electricity, no water. Multiple fleeces were the order of the day.
Was extremely worried about my remaining brain fog getting me into all sorts of muddles but the other volunteers were really nice and supportive.
I had to interact with people, something that I've avoided, but managed to hold conversations in a reasonably lucid manner hopefully.
Must confess to feeling tired at the end of each day, well I was on my feet for over 6 hours each day.
Really pleased that I survived and hope to help again.