David is away from the 16th of June to the 5th or 10th of August.
Louise is away during July.
Jan is away from the 8th to the 22nd of July.
Terry is away from the 16th of July till the 13th of August.
Fran might be away on the 27th of July.
Mel and Rodger are away from the 27th of July to the 20th of October.
Cathy and Roy are away from the 29th of July to the 2nd of September, so Mark is the only bass from the 29th of July to the 2nd of September (basically all August).
Roxane is away from the 10th till the 18th of December.
Di is coming to dinner on Thursday 20th of July but is unavailable after that.