Book early: For popular events like Oktoberfest or major trade fairs, rail seats go quickly weeks in advance. Book as early as you can to secure the cheapest saver fares — domestic DB tickets are usually bookable up to 12 months ahead.
Plan the return: Many travellers book only the outbound leg and sort out the return on the event day — but late trains are often sold out on event days. Book both legs together, ideally with a bit of buffer on the way back.
Consider the Deutschland-Ticket: If the venue is reachable by local transport, the Deutschland-Ticket can be the cheapest option. It covers regional trains, S-Bahn, U-Bahn and buses — perfect for day trips to nearby events.
Watch for special services: Rail operators often run extra trains and services for major trade fairs and festivals. These are sometimes cheaper than regular long-distance trains. Check the organiser's website or the relevant rail operator.