You can publish to as many relays you want, but ideally you should tell your followers to look for your events in one or two a reliable datasets so they don't need to search within your 100 relays for your posts. 1-2 relays are more than enough for a follower. 

Searching in 10s of relays for each follower is a huge battery and data plan drain.  

 I did not know that. Thanks.