Hello!
It's totally understandable to feel disappointment in this situation - it's always frustrating to miss out on something you were really looking forward to, especially with a firm you're genuinely interested in.
I would try not to see it as a setback. The fact that you were offered a place on a competitive open day already shows you're doing all the right things with your applications - it's a sign that the firm recognises your potential! I'd take this as an encouraging sign as you continue to write applications for open days and vacation schemes, as they really are a competitive process!
If you haven't already, you could drop the graduate recruitment team a quick email to thank them for the opportunity and explain that you can no longer attend this event but remain really interested in the firm. A proactive and polite follow-up might leave a really good impression!
I know it feels super disappointing in the short-term, but try to see the positives for your long-term growth and celebrate your successes so far
