A friend's 200th birthday now on Google Calendar

We had a celebration at church last Saturday for one of the congregation's 100th birthday. She is still amazingly spritely, didn't sit down at all during the whole 2 hours. In a passing comment the vicar said we should book in her 200th birthday celebration! So I've now put it, and the 150th one, on the church's Google calendar

I wondered how far ahead I could put an event, it seems it goes up to 9999.