"The venue is in Covent Gardens"
Actually the venue is The Dominion theatre in Tottenham Court road, not Covent garden (only one garden) although not far from it.
"What has St. Albans got to offer?"
It's a city that was once the largest Roman town in Britain; you can still see the remains of some of the Roman buildings in Verulamium Park. If you fancy a drink in one of the oldest pubs in the country, go to The old fighting cocks, which is also in the park.
They have a food and drink festival every year which usually starts before the end of September. My wife and I often visit St Albans when that's on - we live only 30 minutes away.
St Albans is the home of the Royal National Rose Society, and the gardens are well worth a visit if you like roses.
Otherwise, St.Albans is a lovely old place - lots of character, and interesting shops.