1. I am Unable to create Event from Front end side.
You can see this Video : https://priyakant.tinytake.com/sf/NDc5MDk2XzI1NTk2MTY
Also See in the image.
2. In Mozilla, Profile avatar size is too much big while in chrome it looks perfect.
Thanks in advance.
1) Please share the admin credentials with us to check the issue on your site.
2) Please use this custom css in your wp-admin->appearance->customize->custom css:
.bp-user.p3 #item-header-avatar a, .bp-user.p4 #item-header-avatar a {
width: 100%;
}
I couldn't replicate the issue on your site, refer: http://prntscr.com/a0k47s.
I was able to create the event and delete it also, everything seems to be working fine.
There is no such issue on your site.
Please check after clearing the browser cache, and confirm about this.